If the monoprotic acid HAb has a pK of 4 and a solution is adjusted to pH9:A) what is the concentration of hydrogen ions in that solution?B) what is the ratio of Ab- to HAb?

Explain why barium fluoride dissolves in dilute hydrochloric acid but is insoluble in water.

Thymolphthalein is an indicator that changes from colorless to blue at pH 9.5. (a) What is its Ka? (b) What is its pH range? (c) What is the color of a solution with a pH of 10.0 and a few drops of thymolphthalein?

What is an acidbase indicator? Define the equivalence (stoichiometric) point and the end point of a titration. Why should you choose an indicator so that the two points coincide? Do the pH values of the two points have to be within 0.01 pH unit of each other? Explain.

Tile pH of a solution of household ammonia, a 0.950 M solution of NH3 is 11.612. Determine Kb for NH3 from these data.

A 0.210-g sample of an acid (molar mass = 192 g/mol) is titrated with 30.5 mL of 0.108 M NaOH to a phenolphthalein end point. Is the acid monoprotic, diprotic, or triprotic?

Find the values of Kb for the conjugate bases of the following organic acids: (a) glycolic acid, used by dermatologists as a chemical peel; K a =1.5104 (b) butyric acid, responsible for the odor of rancid butter; K a =1.5105

Phthalic acid, H2C8H4O4, is a diprotic acid used in the synthesis of phenolphthalein indicator. Ka1 = 1.2 103, and Ka2 = 3.9 106. a Calculate the hydronium-ion concentration of a 0.015 M solution. b What is the concentration of the C8H4O42 ion in the solution?

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

Which acid in Table 14.2 is most appropriate for preparation of a buffer solution with a pH of 3.1? Explain your choice.