0.20 g of sodium hydroxide (NaOH) pellets are dissolved in water to make 4.5 L of solution. What is the pH of this solution? Express the pH numerically to two decimal places.
Answers
Answer:
11.05( to 2 decimal places).
Explanation:
Without mincing words let's dive straight into the solution the above problem. So, we are given the following parameters which are going to help us in solving this problem;
The mass of sodium hydroxide (NaOH) pellets given = 0.20g and the volume = 4.5 L of solution.
Therefore, the concentration of the solution = number of moles/ volume.
Note that The numbers of moles = mass/molar mass= 0.20g / 40 = 0.005 moles.
Hence, the concentration of the solution = number of moles/ volume = 0.005 moles / 4.5L = 0.00111 M.
pOH = - log[ OH^-] = - log [ 0.00111] = 2.955.
Note that; pH + pOH = 14.
Therefore, pH = 14 - pOH.
pH = 14 - 2.955 = 11.045 = 11.05( to 2 decimal places).
Related Questions
E. Give reasons
1. Oxygen is a diatomic element.
3. The valency of sodium is one.
F. Differentiate between
1. electrovalent bond and covalent bond
2. acidic radical and basic radical
Answers
Answer:
the valency of sodium is one because sodium loses 1 electron to become stable
Which is an oceanic plate?
Somali
Arabian
Nazca
South American
Answers
Answer:
EZ
in my knowledge
Option C Nazca
If 6.0 moles of KClO3 are used, how many moles of O2 can be formed?
Answers
Answer: 9 moles O2
Explanation:
6 moles KClO3 X (3 moles O2/ 2 moles KClO3) = 9.0 Moles O2
Four substances at the same temperature absorb equal
amounts of energy. The specific heat of the four
substances are listed below.
Substance
A. 1.45 J/g °C
B. 2.32 J/g °C
C. 0.98 J/g °C
D. 1.95 J/g °C
Which substance would show the GREATEST increase in
temperature?
A
B
C
D
Answers
Answer:
its that DDDDDD
Explanation:
i know this because its that DDDDDDDD
Given the standard enthalpy changes for the following two reactions
Given the standard enthalpy changes for the following two reactions:
(1) 2C(s) + 2H2(g)C2H4(g)...... ΔH° = 52.3 kJ
(2) 2C(s) + 3H2(g)C2H6(g)......ΔH° = -84.7 kJ
what is the standard enthalpy change for the reaction:
(3) C2H4(g) + H2(g)C2H6(g)......ΔH° = ?
Answers
The standard enthalpy change for reaction (3) is 117.1 kJ.
The standard enthalpy change for reaction (3) can be calculated by using the enthalpy changes of reactions (1) and (2) and applying Hess's Law.
To do this, we need to manipulate the given equations so that the desired reaction (3) can be obtained.
First, we reverse reaction (1) to get the formation of C2H4(g) from C2H6(g):
C2H4(g)C2H6(g) ΔH° = -52.3 kJ
Next, we multiply reaction (2) by 2 and reverse it to obtain 2 moles of C2H6(g) reacting to form 3 moles of H2(g):
2C2H6(g)2C(s) + 3H2(g) ΔH° = 169.4 kJ
Now, we add the two modified equations together:
C2H4(g)C2H6(g) ΔH° = -52.3 kJ
2C2H6(g)2C(s) + 3H2(g) ΔH° = 169.4 kJ
When adding these equations, the C2H6(g) on the left side cancels out with the C2H6(g) on the right side, leaving us with the desired reaction (3):
C2H4(g) + H2(g)C2H6(g) ΔH° = -52.3 kJ + 169.4 kJ = 117.1 kJ
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Using information from your IR spectra for borneol, camphor and isoborneol, answer the following questions:
a. Which peak/s are present in both spectra of pure borneol and pure camphor between 1500 cm-1 - 4000 cm-1 ______________ cm-1
Which functional group/s are responsible for this peak ___________
b. Which peak is present in the spectrum of pure borneol and absent in that pure camphor between 1500 cm-1 - 4000 cm-1 ______________ cm-1
Which functional group/s are responsible for this peak ___________
c. Which peak is present in the spectrum of pure camphor and absent in that pure borneol between 1500 cm-1 - 4000 cm-1 ______________ cm-1
Which functional group/s are responsible for this peak ______________
. Would you expect the IR spectra of borneol and isoborneol to be the same or different? Provide a reason for your answer.
Thank you very much. I appreciate you answering all my questions.
Answers
The functional groups can be identified via IR Spectroscopy, which monitors atom vibrations.
How do you find the IR spectrum of a compound?It is feasible to identify the functional groups using IR Spectroscopy, which monitors the atoms' vibrations. 5 Typically, lighter atoms and stronger connections will vibrate with a higher stretching frequency (wavenumber).
IR spectra of solids and liquids are often produced using straightforward liquid cells after the sample has been dissolved in a solvent that is moderately IR transparent, like CCl4. Another method for studying a solid directly involves grinding it into a fine paste using NUJOLTM, a blend of highly pure hydrocarbons.
The process involves passing infrared light through the organic compound we wish to identify; some of the frequencies are absorbed by the compound, and if we keep track of the light that passes through, the precise frequencies of the absorptions may be determined.
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Why can you find different features at an oceanic convert zone than those found in continental convert zone
Answers
Answer:
Because both the zones have different compositions.
Explanation:
The continental crust is composed of mainly graphite whereas the oceanic crust is made up of basalt. The oceanic plates are thinner than the continental plates. Also the oceanic plates are much denser as compared to the continental plates. Now the continental plates at the convergent boundary gained thickness as they are pushed upward. These plates or zones are of different composition an densities and so when they collide different features can be seen at the two conversion zones.
A student is extracting caffeine from water with dichloromethane. The K value is 4.2. If the student starts with a total of 30 mg of caffeine in 2 mL of water and extracts twice with 2 mL of dichloromethane, how much caffeine will be in the dichloromethane extract
Answers
Answer:
787.5 is a transversal of lines I and m that forms 8 angles and the other way around the world health organization and the other one is a transversal of lines I and m that forms 8 angles and the other things that you can see in the picture of with the first term 8 and a common ratio of the following values would be a little different to the one you have the
3. Describe what happens to the light ray when above and below the line are both AIR
Answers
When a light ray passes through a boundary between air and air (or the same medium), there is no change in its direction or speed. The ray continues to travel in a straight line with the same velocity.
Reaction of light rayWhen a light ray passes through a boundary between two media, it can change direction and speed due to a change in the refractive index of the medium.
However, if both sides of the boundary are the same medium, such as in the case of air and air, the refractive index remains constant, and there is no change in the direction or speed of the light ray.
As the light ray enters the second air medium, it continues to travel in a straight line with the same velocity as before.
This is because the refractive index of air is the same on both sides of the boundary, and there is no bending or refraction of the light ray.
In other words, the light ray remains parallel to its original path and undergoes no change in its velocity or direction.
This behavior is described by the laws of reflection and refraction, which govern the behavior of light rays at boundaries between different media.
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0/ 1 A traveler heading on a trip packs a bag of mixed nuts for the plane. As the plane travels higher in the atmosphere, the inside pressure of the plane decreases to 85 kPa. Midway through the plane ride, the traveler decides to have the mixed nuts as a snack. The traveler discovers that the bag has inflated when it is taken out to be opened. The initial volume of the bag of mixed nuts was 250 mL at 101 kPa. Select the gas law and explanation that best describes the phenomenon that the traveler experienced on the plane
Answers
The Boyles law is the gas law that shows the relationship between the volume and the pressure of the gas .
State the Boyle's law?The fall in the pressure would cause the molecules of the gas to spread out and thus the volume of the gas would be found to have increased. This exactly what can account for what we have seen ion the question above and is described by the Boyle's law.
Boyle's law, which specifies the relationship between a gas's pressure and volume at a fixed temperature, is a fundamental tenet of physics and chemistry. Robert Boyle, an Irish scientist who made the discovery in the 17th century, is honored by the law's name.
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write the condensed, complete, and net ionic equations for any reaction that occurs between K2CrO4(aq) and Fe(NO3)3(aq).
Answers
Answer:
Condensed equation: \(3K_2CrO_4(aq)+2Fe(NO_3)_3(aq)\rightarrow Fe_2(CrO_4)_3(s)+6KNO_3(aq)\)
Complete ionic equation : \(6K^+(aq)+3CrO_4^-(aq)+2Fe^{2+}(aq)+6NO_3^-(aq)\rightarrow Fe_2(CrO_4)_3(s)+6K^+(aq)+6NO_3^-(aq)\)
Net ionic equation : \(3CrO_4^-(aq)+2Fe^{2+}(aq)\rightarrow Fe_2(CrO_4)_3(s)\)
Explanation:
A double displacement reaction is one in which exchange of ions take place. The salts which are soluble in water are designated by symbol (aq) and those which are insoluble in water and remain in solid form are represented by (s) after their chemical formulas.
The balanced chemical equation is:
\(3K_2CrO_4(aq)+2Fe(NO_3)_3(aq)\rightarrow Fe_2(CrO_4)_3(s)+6KNO_3(aq)\)
Condensed equation : \(3K_2CrO_4(aq)+2Fe(NO_3)_3(aq)\rightarrow Fe_2(CrO_4)_3(s)+6KNO_3(aq)\)
Complete ionic equation : In complete ionic equation, all the substance that are strong electrolyte and present in an aqueous are represented in the form of ions.
\(6K^+(aq)+3CrO_4^-(aq)+2Fe^{2+}(aq)+6NO_3^-(aq)\rightarrow Fe_2(CrO_4)_3(s)+6K^+(aq)+6NO_3^-(aq)\)
Net ionic equation : In the net ionic equations, we are not include the spectator ions in the equations. Spectator ions are the ions present on reactant and product side which do not participate in a reactions. The same ions present on both the sides.
\(3CrO_4^-(aq)+2Fe^{2+}(aq)\rightarrow Fe_2(CrO_4)_3(s)\)
The answer is suppose to be B but I don’t understand why not D
Answers
Which of the following are held together by nonpolar covalent bonds?
The Periodic Table
A. Atoms of phosphorus (P) and chlorine (CI)
B. Atoms of chlorine (CI)
C. Atoms of chlorine (CI) and magnesium (Mg)
D. Atoms of magnesium (Mg)
Answers
Answer:
Answer: Atoms of chlorine (CI) and magnesium (Mg)
Answer: Atoms of chlorine (CI) and magnesium (Mg)is your answer
Increasing the temperature increases the ray of reaction . Which is the best explanation for this happening.
Answers
Increasing the temperature enhances the rate of reaction because it provides more kinetic energy to the reactant molecules, allowing them to collide more frequently and with greater energy.
When the temperature is increased, the average kinetic energy of the reactant molecules also increases. This results in more frequent and energetic collisions between the reactant molecules.
The kinetic energy determines the speed and force with which molecules collide, and a higher collision frequency increases the chances of successful collisions leading to a reaction.
Additionally, the increased kinetic energy provides the activation energy required for the reactant molecules to overcome the energy barrier and form the products.
The Boltzmann distribution explains that at higher temperatures, a greater proportion of molecules have sufficient energy to surpass the activation energy. Overall, the increased temperature promotes a higher reaction rate by increasing collision frequency and providing the necessary energy for the reaction to occur.
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EARTH SCIENCE: PLEASE HELP ME !!! Which tools do astronomers use to determine the effects of collisions between galaxies? Select the two correct answers.(1 point)
computer simulations
print encyclopedia entries
space telescopes
solar system models
Answers
In studying effects of collisions between galaxies, astronomers usually make use of space telescopes.
Astronomy deals with the study of outer space. The study focuses on planets and other celestial bodies. Generally telescopes are used to study outer space. The particular type of telescope that is used depends on the need.
In studying effects of collisions between galaxies, astronomers usually make use of space telescopes.
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How many liters of wine can be held in a wine barrel whose capacity is 30.0 gal? You had been given a new penny to test if it is made up of pure copper or not. You measured the mass of the penny which was 2.49 g. You then find that the penny displaces 0.349 cm3 of water. Is the penny made of pure copper? (Density of pure copper = 8.96 g/cm3)
Answers
The first step in this calculation is to know how many liters is equal to 1 gallon, and the value is 3.785 liters, so now we have to make the following calculation:
1 gal = 3.785 Liters
30.0 gal = x Liters
x = 3.785 * 30.0
x = 114 Liters
HELP!
Mrs. Grogan wants to know if she is packing the same amount of animal crackers for her son’s snack each day.
She fills up a sandwich bag full of animal crackers each day. Mrs. Grogan takes the mass of the animal crackers and discovers that she uses 23.4 g, 25.2 g, 24.3g, 24.4 g, and 24.8 g of animal crackers for each day during the week. Convert the average mass into kilograms and record your answser to the correct number of significant figures. NO UNITS!
Answers
what is the definition of behavior?
Answers
Answer:
the definition of behavior is the way in which someone conducts oneself or behaves.
Answer:
the way in which one acts or conducts oneself, especially towards others.
For example
he will vouch for her good behaviour"
What mantle is forced down and begins to melt?
HELP!
Answers
Answer:
magma
Explanation:
Answer:
magma rises through it.
Explanation:
Which of the following reactions would result in decreased entropy?
Q A. CO,(s) → CO2(g)
OB. H₂O(g) → H₂O()
OC. 203(g) → 30₂(g)
D. N₂204(g) → 2NO₂(g)
Answers
The reaction that would result in decreased entropy is : ( A ) CO(s) → CO2(g)
What are Endothermic reactionsReactions that absorb heat from its surroundings are known as endothermic reactions, Endothermic reactions result in a decreased entropy as the temperature of the surrounding becomes lower than the temperature of the container where the reaction occurs.
Examples of endothermic reactions are : melting and evaporation which results in the change of state from solid to liquid or from solid to gaseous state.
Hence we can conclude that The reaction that would result in decreased entropy is : ( A ) CO(s) → CO2(g)
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Which processes involve nuclear changes?
A. fission and fusion
B. erosion and weathering
C. combustion and oxidation
D. evaporation and condensation
Answers
Answer:
Nuclear processes, including fusion, fission, and radioactive decays of unstable nuclei, involve changes in nuclear binding energies.
Explanation:
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volume displacement is used to determine the volume of an irregularly shaped metal sample. the gradauted cylinder initially contains 23.6 ml of water. after the metal sample is added to the graduated cylinder, the volume is 29.8 ml . what is the volume of the metal sample?
Answers
The volume of the metal sample is 6.2 ml
The theory behind this is that the volume of the metal is what causes the increase in water volume in the cylinder.
This means that by comparing the volume occupied by the water and metal together and the amount occupied by the water alone in the cylinder, you can determine the volume of the metal.
To be more specific, the volume of the metal will be,
Vmetal= Vwater + metal - Vwater
In this case, we have
Vwater = 23.6 ml
Vwater + metal = 29.8 ml
So,
Vmetal = 29.8 ml - 23.6 ml = 6.2 ml
Thus the volume of the metal sample is 6.2 ml.
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Can someone pls help, I’m sorry if it’s a lot
Answers
Explaining: you gotta add
If the titration of a 25.0 mL sample of calcium hydroxide requires 34.45 mL of 0.100 M hydrochloric acid, what is the molarity of the base?
Answers
The molarity of the base, Ca(OH)₂ needed for the reaction is 0.0689 M
We'll begin by writing the balanced equation for the reaction. This is given below:
Ca(OH)₂ + 2HCl —> CaCl₂ + 2H₂O
From the balanced equation above,
The mole ratio of the acid, HCl (nA) = 2
The mole ratio of the base, Ca(OH)₂ (nB) = 1
From the question given above, the following data were obtained:Volume of base, Ca(OH)₂ (Vb) = 25 mL
Volume of acid, HCl (Va) = 34.45 mL
Molarity of acid, HCl (Ma) = 0.1 M
Molarity of base, Ca(OH)₂ (Mb) =?The molarity of the base needed for the reaction can be obtained as follow:
MaVa / MbVb = nA / nB
(0.1 × 34.45) / (Mb × 25) = 2
3.445 / (Mb × 25) = 2
Cross multiply
Mb × 25 × 2 = 3.445
Mb × 50 = 3.445
Divide both side by 50
Mb = 3.445 / 50
Mb = 0.0689 MThus, the molarity of the base, Ca(OH)₂ needed for the reaction is 0.0689 M
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what is the physical state of element chromium
Answers
Answer:
Solid metal.
Explanation:
At room temperature, Chromium (Cr), a transition metal, is a solid.
What are the positive relationships of the great white shark called?
Answers
PLEASE HELP!!
Balance the equation below to answer the question. Suppose you mix 3.25 grams of nitrogen trihydride with 3.50 grams of oxygen gas. How many grams of nitrogen monoxide would you make?
A. 2.63 grams
B. 2.11 grams
C. 4.34 grams
D. 3.45 grams
E. 1.76 grams
Answers
What does the electron configuration for the noble gases tell us about the elements in the
group
Answers
Answer:That all noble gases will have 8 valence electrons which makes a atom stable
Explanation:
pls help me to answer this:(
Answers
Answer:
How do one confess feelings to her if he is introvert?
what functional group is commonly used in cells to transfer energy?
Answers
A phosphate is an anion, salt, utilitarian gathering or ester got from phosphoric corrosive.