Answers
To calculate the moles of HCl added to the acidic buffer before its buffering capacity was exceeded, we need to find the point at which the pH changes significantly. This will tell us where the buffering capacity of the acidic buffer was exceeded.
Looking at the given data, we can see that there is a significant change in pH between 10 mL and 15 mL of HCl added. The pH drops from 2.41 to 1.8, indicating that the buffering capacity has been exceeded.
To calculate the moles of HCl added before this point, we can use the following steps:
Calculate the initial moles of HCl present in the buffer before any HCl was added. This can be done using the initial pH of the buffer and the known dissociation constant (Ka) for the weak acid in the buffer. For example, if the buffer is made from acetic acid (CH3COOH) and its initial pH is 4.5, then we can use the Ka value for acetic acid (1.8 x 10^-5) to calculate the initial concentration of CH3COOH in the buffer.
Subtract the initial moles of H+ in the buffer from the total moles of H+ at the point
Convert the moles of H+ to moles of HCl by multiplying by the stoichiometric coefficient of HCl in the reaction (which is 1).
Without additional information such as the initial pH of the buffer and the dissociation constant of the weak acid used in the buffer, we cannot perform this calculation.
What is an acid ?An acid is a chemical substance that donates protons (hydrogen ions) or accepts electrons in a chemical reaction. Acids have a pH value less than 7 and are characterized by their sour taste and ability to dissolve certain metals, such as zinc and iron.
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Related Questions
Convert 360 k to Celsius
Answers
Answer:
86.85°C
Explanation:
K = °C + 273.15
360K − 273.15 = 86.85°C ≈ 87°C
An alternating current can be described as one in which:
A. Electrons flow in both directions in the circuit.
B. Electrons flow in only one direction in the circuit
C. Electrons move only from the negative terminal of the battery.
D. Electrons move only from the positive terminal of the battery.
Answers
A
Explanation:
electrons flow in both directions
Answer: A I know it but I forgot how to explain it.
When measuring solid NaOH in pellet form, explain why you won’t be able to measure exactly 1.000 grams. What are the consequences of this?
Answers
Answer:
Explanation:
Pellet form of NaOH is highly hygroscopic . It absorbs moisture from air and its weight is increased by the time one tries to weigh one gram of it . Moreover it also reacts with carbon dioxide gas of atmosphere to form sodium carbonate .
2 NaOH + CO₂ = Na₂CO₃ + H₂0.
It also increases its weight .
An experiment is performed to determine to determine the molar mass of a solid unknown monoprotic acid (HA) by titration with a standardized NaOH solution. A) What measurements must be made to determine the number of moles of NaOH used in the titration? B) Write a mathematical expression to be used in determining the number of moles used to reach the endpoint of the titration. C) How can you use the information in B) to determine the moles of acid, HA? D) To determine the molar mass of the acid what should be measured about the acid before the titration? E) Write the mathematical expression to calculate the molar mass of the acid. F) Draw the apparatus to be used in this titration indicating what is going to be in each part of the apparatus. G) If the original solid acid was not completely dry before the experiment, would the results be different? In which way? Explain. H) If the original procedure called for dissolving the acid in 25.0 mL , but 35.0 mL were accidentally used, how would the results be affected? Explain.
Answers
The number of moles of NaOH is calculated by multiplying the moles of KHP by the mole ratio of NaOH to KHP, which is found by the balanced chemical reaction previously discussed.
Why is it called titration?A titration is described as "the process of determining the amount of a substance A by adding calibrated increments of substance B, the titrant, with which it reacts until exact chemical equivalency is obtained (the equivalence point)" (Oxford Dictionary of Chemical Terms).
The moles of KHP are multiplied by the mole ratio of NaOH to KHP, which is determined by the balanced chemical reaction mentioned above, to determine the number of moles of NaOH. 3. To determine the molarity of the NaOH solution, divide the moles of NaOH by the amount of NaOH solution needed to reach the titration's endpoint, in this case, litres.
The formula is molarity (M) of the acid x volume (V) of the acid = molarity (M) of the base x volume (V) of the base when the titrant and analyte have a mole ratio of 1:1. The concentration of a solution, measured in moles of solute per litre of solution, is known as its molarity.
Ha has a 268-gram mass per mole in its molar form. Ha is not a recognised chemical symbol for an element.
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60 points!! Look at picture please don’t troll
Answers
For the reaction 2Fe+o2 -->Feo how many grams of iron(ll) oxide are produced from 479.6 grams of iron in an excess of oxygen (Fe=56gmol, O=16g mol)
Answers
Mass of iron(ll) oxide= 616.608 g
Further explanationGiven
Reaction
2Fe+O2 -->2FeO
479.6 grams of iron
Required
mass of iron(ll) oxide
Solution
mol of iron :
= mass : Ar Fe
= 479.6 g : 56 g/mol
= 8.564
From the equation, mol FeO :
= 2/2 x mol Fe
= 2/2 x 8.564
= 8.564 moles
Mass of iron(ll) oxide :
= mol x MW
= 8.564 x 72 g/mol
= 616.608 g
A sea turtle is 3feet below the surface of the sea ??? Help me ple
Answers
Given the following data for water:
Heat of fusion = 334 J/g
Heat of vaporization = 2,256 J/g
Specific heat of solid = 2.09 J/g °C)
Specific heat of liquid = 4.184 J/g °C)
Specific heat of gas = 1.84 J/g °C)
Calculate how much energy is needed to change 100.0 grams of liquid water at 15.0 °C to vapor at 125.0 °C. (3 points)
Oa
O
b
44,000 J
89,400 J
104,000 J
266,000 J
Answers
1. Heating the liquid water from 15.0 °C to 100.0 °C:
q = m * Cp * ΔT
= 100.0 g * 4.184 J/g °C * (100.0 °C - 15.0 °C)
= 34,972 J
2. Vaporizing the liquid water at 100.0 °C:
q = m * Hvap
= 100.0 g * 2,256 J/g
= 225,600 J
3. Heating the water vapor from 100.0 °C to 125.0 °C:
q = m * Cp * ΔT
= 100.0 g * 1.84 J/g °C * (125.0 °C - 100.0 °C)
= 4,600 J
The total energy required is the sum of the three steps:
Q = q1 + q2 + q3
= 34,972 J + 225,600 J + 4,600 J
= 265,172 J
Therefore, the energy needed to change 100.0 grams of liquid water at 15.0 °C to vapor at 125.0 °C is approximately 265,172 J, which is closest to option (d) 266,000 J.
How many amino acids can be coded for with 33 bases on a DNA strand?
Answers
Answer:
660 amino acids.
Explanation:
There is 20 amino acids for one base. So you multiply 33x20 to give you 660.
Answer:
Assuming that the DNA strand is read in sets of three nucleotides (codons), then 33 bases would allow for a maximum of 11 codons to be read.
Each codon codes for one amino acid, so 11 codons would allow for the coding of a maximum of 11 amino acids.
Explanation:
how many moles are in 2.91 × 10²² atoms of He?
Answers
Answer:
0.048 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
\(n = \frac{N}{L} \\\)
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
\(n = \frac{2.91 \times {10}^{22} }{6.02 \times {10}^{23} } \\ = 0.04833887...\)
We have the final answer as
0.048 molesHope this helps you
Helen knit a total of 175 centimeters of scarf over 35 nights. How many nights will Helen have to spend knitting in order to knit a total of 180 centimeters of scarf? Solve using unit rates.
Answers
Helen takes 35 nights to knit a total of 175 centimeters of scarf. Hence, she will take 36 nights to knit 180 centimeters of scarf.
What are length units?Length is a basic measurement in for an object which is basically taken in meters or centimeters. The basic unit of length in American standard is meters (m) and in CGS system it is centimeters.
It is given that, Helen knit a total of 175 centimeters of a scarf over 35 nights. Then, the length she knit in one nigh is calculated as:
175/35 = 5 cm.
Therefore, the number of nights required to complete 180 cm is :
180 /5 = 36
Thus, she will take 36 nights to knit a total of 180 cm of scarf.
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A container holds 40.0 mL of nitrogen at 30° C and at a constant pressure.
Find its volume if the temperature increases to 80° C?
Answers
Answer:
The correct answer is - 46.60 mL.
Explanation:
To find the volume of the gas at its new increased temperature we need to use Charl Law that shows the direct relationship between Volume and Temperature while Pressure remains constant.
V1 = 40 ml
T1 = 30 degree C + 273 = 303 K
V2 = ?
T2 = 80 degree C + 273 = 353 K
Charl Equation is:
V 1/T 1 = V 2/ T 2
(V1) * (T2)/ T1= V2
placing value:
40*353/303 = V2
= 14120/303
Vf = 46.60 mL
What is the number of moles of solute in 7.3L of a 4.6M solution?
Answers
Answer:
33.58 Moles
Explanation:
7.3 L * 4.6 M / L = 33.58 Moles
scientist wants to use a model to help present the results of his detailed scientific investigation.
Why would a model be useful?
because the model makes the concepts easier to understand
because the model is easy to put together and to use
because the model prevents other scientists from asking questions
because the model requires the audience to pay full attention to it
Answers
Answer: A model would be useful because the model makes the concepts easier to understand.
Explanation:
Models are helpful tools in science education that can be used to enhance explanations, spark discussion, make predictions, provide visual representations of abstract concepts, and create mental models.
Net ionic equation for potassium sulfide and magnesium iodide
Answers
The net ionic equation for the reaction between potassium sulfide and magnesium iodide is S2- + Mg2+ -> MgS, as the potassium and iodide ions are spectator ions and do not participate in the reaction.
To determine the net ionic equation for the reaction between potassium sulfide (K2S) and magnesium iodide (MgI2), we first need to identify the ions present in each compound and then determine the products formed when they react.
Potassium sulfide (K2S) dissociates into two potassium ions (K+) and one sulfide ion (S2-):
K2S -> 2K+ + S2-
Magnesium iodide (MgI2) dissociates into one magnesium ion (Mg2+) and two iodide ions (I-):
MgI2 -> Mg2+ + 2I-
Now, we need to determine the possible products when these ions combine. Since potassium (K+) has a +1 charge and iodide (I-) has a -1 charge, they can combine to form potassium iodide (KI):
K+ + I- -> KI
Similarly, magnesium (Mg2+) and sulfide (S2-) can combine to form magnesium sulfide (MgS):
Mg2+ + S2- -> MgS
Now, we can write the complete ionic equation by representing all the ions present before and after the reaction:
2K+ + S2- + Mg2+ + 2I- -> 2KI + MgS
To obtain the net ionic equation, we remove the spectator ions, which are the ions that appear on both sides of the equation and do not participate in the actual reaction. In this case, the spectator ions are the potassium ions (K+) and the iodide ions (I-).
Thus, the net ionic equation for the reaction between potassium sulfide and magnesium iodide is:
S2- + Mg2+ -> MgS
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The solubility in water of lonic compound X is measured and found to be 52.6 at 10. °C. Calculate the volume of a saturated solution of X in water that wouldcontain 43.0 g of X' at this temperature.Be sure your answer has the correct unit symbol and 3 significant digits.D.DH8
Answers
In this question, we are presented with a substance X with a solubility of 52.6 g/L, which means that in every 1 liter of volume, we will dissolve 52.6 grams of it at 10°C. Now the question asks about the volume for 43.0 grams at the same temperature:
52.6 grams = 1 Liter
43.0 grams = x Liters
52.6x = 43.0
x = 43.0/52.6
x = 0.817 Liters of volume
Why is crushability alone not enough to
verify the identity of these materials?
Answers
Answer:same but answer
Explanation:yeah confusing
A sample of copper absorbs 4.31E+1 kJ of heat, resulting in a temperature rise of 6.71E+1 °C. Determine the mass (in kg) of the copper sample if the specific heat capacity of copper is 0.385 J/g°C.
Answers
Answer: 1.67 kg
Explanation:
The quantity of heat required to raise the temperature of a substance by one degree Celsius is called the specific heat capacity.
\(Q=m\times c\times \Delta T\)
Q = Heat absorbed=\(4.31\times 10^1kJ\) = \(43100J\) (1kJ=1000J)
m= mass of substance = ?
c = specific heat capacity = \(0.385J/g^0C\)
Change in temperature ,\(\Delta T=T_f-T_i=6.71\times 10^1^0C=67.1^0C\)
Putting in the values, we get:
\(43100J=m\times 0.385J/g^0C\times 67.1^0C\)
\(m=1670g=1.67kg\) (1kg=1000g)
Thus the mass (in kg) of the copper sample is 1.67
PLEASE ANSWER QUICKLY!!!!
2KI (aq) + Cl₂(g) → 2KCl(aq) + 1₂(g)
What volume of 12 gas forms when
21 L Cl2 react at STP?
[?] L 12
Answers
The volume of 12 gas forms when 21 L Cl2 react at STP is 21 L.
To determine the volume of 12 gas (I assume you mean I2 gas) formed when 21 L of Cl2 reacts at STP (standard temperature and pressure), we need to use the ideal gas law equation.
The ideal gas law equation is given by:
PV = nRT
Where:
P = pressure
V = volume
n = number of moles
R = ideal gas constant
T = temperature
At STP, the pressure is 1 atm, and the temperature is 273.15 K.
From the balanced equation, we can see that the molar ratio between Cl2 and I2 is 1:1. So, if 21 L of Cl2 reacts, it will produce an equal volume of I2 gas.
Given that the volume of Cl2 is 21 L, we can assume the volume of I2 gas formed will also be 21 L.
Therefore, the volume of I2 gas formed is 21 L.
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A student accidentally drops the watch glass atop the evaporating dish containing the
dried salt, and it breaks. How could this affect the calculations?
Answers
Answer:
the experiment measurements might been thrown off
Explanation:
Record your data either in your lab notebook or in the space below.
Step
Material
Change(s) Observed
Type of Change (Physical/Chemical)
Reasoning
2
Calcium carbonate
3
Calcium carbonate and hydrochloric acid
4
Water
5
Copper sulfate
Pentahydrate
6
Iron filings and sulfur
7
Lead nitrate and potassium iodide
8
Magnesium and hydrochloric acid
9
Candle
Answers
Review and analyze the data recorded during the experiment to draw conclusions and better understand the types of physical and chemical changes that occurred.
Step 1: Organize your data in a table format in your lab notebook or the space provided.
Step 2: Record the initial material, Calcium carbonate.
Step 3: When Calcium carbonate reacts with hydrochloric acid, the changes observed would be the formation of bubbles and fizzing. This is a chemical change due to the formation of a new substance, calcium chloride, and the release of carbon dioxide gas.
Step 4: For water, there is no reaction observed. This step represents a physical change, as water does not alter the chemical composition of the other materials.
Step 5: When Copper sulfate pentahydrate is added to water, the change observed is the dissolution of the solid into the water, forming a blue solution. This is a physical change because the chemical composition of the copper sulfate remains the same.
Step 6: When Iron filings and sulfur are mixed together, no observable change occurs. This is a physical change since the individual substances are not chemically reacting.
Step 7: When Lead nitrate reacts with potassium iodide, a yellow precipitate (Lead iodide) forms. This is a chemical change due to the formation of new substances.
Step 8: When Magnesium reacts with hydrochloric acid, the change observed is the formation of bubbles and the disappearance of the magnesium. This is a chemical change due to the formation of magnesium chloride and the release of hydrogen gas.
Step 9: When a candle is burned, the change observed is the flame and the production of heat and light. This is a chemical change as new substances are formed, such as carbon dioxide and water vapor.
Remember to review and analyze the data recorded during the experiment to draw conclusions and better understand the types of changes (physical or chemical) that occurred.
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Cellular respiration is a chemical process in cells that releases energy the cells need to function. What statement below is true about this reaction.
A. The process of cellular respiration releases energy because the energy that is released when the bonds are formed in CO2 and water is equal to the energy required to break the bonds of sugar and oxygen.
B. The process of cellular respiration releases energy because the energy that is released when the bonds that are formed in CO2 and water is lost when bonds of glucose and oxygen are broken.
C. The process of cellular respiration releases energy because the energy that is released when the bonds are formed in CO2 and water is less than the energy required to break the bonds of sugar and oxygen.
D. The process of cellular respiration releases energy because the energy that is released when the bonds are formed in CO2 and water is greater than the energy required to break the bonds of sugar and oxygen.
Answers
The process of cellular respiration releases energy because the energy that is released when the bonds are formed in CO\(_2\) and water is equal to the energy required to break the bonds of sugar and oxygen. Therefore, the correct option is option A.
Cells turn sugars into energy through a process called cellular respiration. Cells need fuel or an electron acceptor to power the chemical process that converts energy into usable forms such as ATP along with additional kinds of energy that can be utilised to power cellular reactions.
All multicellular species, including eukaryotes, as well as certain single-celled organisms, generate energy by aerobic respiration. Utilising oxygen, which is the strongest electron acceptor found in nature, is called aerobic respiration. The process of cellular respiration releases energy because the energy that is released when the bonds are formed in CO\(_2\) and water is equal to the energy required to break the bonds of sugar and oxygen.
Therefore, the correct option is option A.
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What is the best way to diagnose organic vehicles IR or NMR and why
Answers
Answer:
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Solutions, _____ colloids, _____ light.
a) like, will not scatter
b) unlike, will not scatter
c) like, will scatter
d) unlike, will scatter
Answers
Answer: unlike, will not scatter
Explanation:
Colloids are unlike solutions because their dispersed particles are much larger than those of a solution. The dispersed particles of a colloid cannot be separated by filtration, but they scatter light, a phenomenon called the Tyndall effect.
How many molecules in 3.4 moles of NH4NO3?
Answers
There are 20.5 x 10^24 molecules are present in 3.4 moles of NH4NO3.
How many molecules in 3.4 moles of NH4NO3?We know that one mole of a substance has 6.022 × 10²³ molecules so in 3.4 moles of NH4NO3, we have 20.5 x 10^24 molecules if we multiply the 6.022 × 10²³ with 3.4.
So we can conclude that there are 20.5 x 10^24 molecules are present in 3.4 moles of NH4NO3.
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What are the characteristics of nonvascular plants? (select all that apply) A . They don’t rely on roots to receive water.
B .They have xylem vessels and phloem vessels
C . They are able to push water and nutrients to each part of the plant.
D . They are found in moist environments.
Answers
Answer:
D . They are found in moist environments.
Explanation:
Nonvascular plants do not have a xylem or phloem, roots, stems, or leaves. Because these plants lack water-conducting tissues, they fail to achieve the structural complexity and size of most vascular plants and have evolved in habitats which allow their survival and reproduction.
The plant body that is most obvious in non-vascular plants are the the gametophyte generation. The gametophte gemeration is haploid.
The non-vascular plants grow in moist environments. It is due to lack of vascular tissue that requires to maintain close contact with water to prevent desiccation. Nonvascular plants are plants that do not have any special internal pipelines or channels to carry water and nutrients. Instead, nonvascular plants absorb water and minerals directly through their leaflike scales. Nonvascular plants are usually found growing close to the ground in damp, moist places. Non-vascular plants thrive in damp conditions since they don't need to rely on roots to acquire enough water.
Hey can anyone pls solve these problems!!! pls
Answers
What is the volume of 0.960 moles of sulfur trioxide?
Answers
Answer:
76.86g
Explanation:
the molar mass of sulfur trioxide is about 80.06, so 80.06 grams per mol, 0.96*80.06=76.86g
Which of the following indicates the percentage of the natural occurrence of an isotope of an element on the planet?
A. Atomic mass
B. Atomic mass unit
C. Natural abundance
D. Isotope
Answers
Answer:
C. Natural abundance
Explanation:
The percentage of natural occurrence of an isotope of an element on the planet is the natural abundance or the geonormal abundance.
Proportions of each isotope of an element that occurs naturally is the natural abundance. It is represented as a percentage value. From the natural abundance, we can determine the relative atomic mass. If we know the atomic mass of each of the isotope and their abundances, it is easy to determine their relative atomic masses.HQ5.40
Homework Answered Due Today, 11:59 PM
The reaction 3H₂(g) + N₂(g) → 2NH3(g) has an enthalpy of reaction of -92.6 kJ/mol. If 1 g of hydrogen and 2 g of nitrogen are
reacted, how much heat is produced (kJ)?
Answers
The amount of heat energy produced when 1 g of hydrogen and 2 g of nitrogen are reacted, is -6.61 KJ
How do i determine the heat energy produced?First, we shall obtain the limiting reactant. Details below:
3H₂ + N₂ -> 2NH₃
Molar mass of N₂ = 28 g/molMass of N₂ from the balanced equation = 1 × 28 = 28 g Molar mass of H₂ = 2 g/molMass of H₂ from the balanced equation = 3 × 2 = 6 gFrom the balanced equation above,
28 g of N₂ reacted with 6 g of H₂
Therefore,
2 g of N₂ will react with = (2 × 6) / 28 = 0.43 g of H₂
We can see that only 0.43 g of H₂ is needed in the reaction.
Thus, the limiting reactant is N₂
Finally, we the amount of heat energy produced. Details below:
3H₂ + N₂ -> 2NH₃ ΔH = -92.6 KJ
Molar mass of N₂ = 28 g/molMass of N₂ from the balanced equation = 1 × 28 = 28 gFrom the balanced equation above,
When 28 grams of N₂ reacted, -92.6 KJ of heat energy were produced.
Therefore,
When 2 grams of N₂ will react to produce = (2 × -92.6) / 28 = -6.61 KJ
Thus the heat energy produced from the reaction is -6.61 KJ
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