Answered: Question 33 Identify the indicator that… | bartleby

Chemistry: An Atoms First Approach

Chemistry: An Atoms First Approach

2nd Edition

ISBN:9781305079243

Author:Steven S. Zumdahl, Susan A. Zumdahl

Publisher:Steven S. Zumdahl, Susan A. Zumdahl

Chapter14: Acid- Base Equilibria

Section: Chapter Questions

Problem 79E

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Question 33
Identify the indicator that can be used at
- -/1
the highest pH. (Refer to Fig. 14.19 in the ebook)
1
alizarin
2
thymolphthalein
3 thymol blue
4 methyl red
5
alizarin yellow R

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Two students were asked to determine the Kb of an unknown base. They were given a bottle with a solution in it. The bottle was labeled aqueous solution of a monoprotic strong acid. They were also given a pH meter, a buret, and an appropriate indicator. They reported the following data: volume of acid required for neutralization = 21.0 mL pH after 7.00 mL of strong acid added = 8.95 Use the students' data to determme the Kb of the unknown base.
A solution has a pH of 4.5. What would be the color of the solution if each of the following indicators were added? (See Fig. 14-8.) a. methyl orange b. alizarin c. bromcresol green d. phenolphthalein
. The “Chemistry in Focus” segment Garden-Variety Acid— Base Indicators discusses acid-base indicators found in nature. What colors are exhibited by red cabbage juice under acid conditions? Under basic conditions?
Explain why an acid-base indicator changes color over a range of pH values rather than at a specific pH.
A solution is made by dissolving 15.0 g sodium hydroxide in approximately 450 mL water. The solution becomes quite warm, but after it is allowed to return to room temperature, water is added to bring the volume to 500.0 mL of solution. (a) Calculate the pH and pOH in the final solution. (b) Why would we wait for it to return to room temperature? (c) If the mass of the water used to initially dissolve the sodium hydroxide were exactly 450 g and the temperature of the water increased by 8.865 C, how much heat was given off by the dissolution of 15.0 g of solute? Assume the specific heat of the solution is 4.184 J/g. K. What is the molar heat change for the dissolution of sodium hydroxide (known as the enthalpy of solution, Hsol)?
. Write the formulas for three combinations of weak acid and salt that would act as buffered solutions. For each of your combinations, write chemical equations showing how the components of the buffered solution would consume added acid and base.
The following four diagrams represent aqueous solutions containing a weak acid (HA) and/or its conjugate base (A). Which of the four solutions is a buffer solution? There may be more than one correct answer.
For oxyacids, how does acid strength depend on a. the strength of the bond to the acidic hydrogen atom? b. the electronegativity of the element bonded to the oxygen atom that bears the acidic hydrogen? c. the number of oxygen atoms? How does the strength of a conjugate base depend on these factors? What type of solution forms when a nonmetal oxide dissolves in water? Give an example of such an oxide. What type of solution forms when a metal oxide dissolves in water? Give an example of such an oxide.
Compare the percent ionization of the base in Exercise 22a with the percent ionization of the base in Exercise 22d. Explain any differences.
Note whether hydrolysis occurs for each of the following ions. If hydrolysis docs occur, write the chemical equation for it. Then write the equilibrium expression for the acid or base ionization (whichever occurs). a NO3 b OCl c NH2NH3+ d Br
Which of the following beakers best represents a container of a weak acid, HA, in water? (Water molecules have been omitted for clarity.)

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