## [answered] 18. Calculate the pH and the pOH of each of the following s

18. Calculate the pH and the pOH of each of the following solutions at 25 ?C for which the

substances ionize completely:

(a) 0.200 M HCl

(b) 0.0143 M NaOH

(c) 3.0 M HNO3

(d) 0.0031 M Ca(OH)2

36. What is the ionization constant at 25 ?C for the weak acid (CH3)2 NH2 +, the conjugate

aci? of the weak base ?CH3)2NH, Kb = 7.4 ? 10?4?

52. Which of the following will increase the percent of HF that is converted to the fluoride ion

in water?

60. Calculate the ionization constant for each of the following acids or bases from the

ionization constant of its conjugate base or conjugate acid:

(a) F?

(b) NH4 +

(c) AsO4 3?

(d) (CH3)2NH2+

(e) NO2?

(f) HC2 O4 ? ?as a base)

78. Determine whether aqueous solutions of the following salts are acidic, basic, or neutral:

(a) Al(NO3)3

(b) RbI

(c) KHCO2

(d) CH3NH3Br 90. What is [H3O+] in a solution of 0.075 M HNO2 and 0.030 M NaNO2? HNO2(aq) + H2 O(l)

? H3 O+(aq) + NO2 ?(aq) Ka = 4.5 ? 10?5

98. Calculate the pH of a buffer solution prepared from 0.155 mol of phosphoric acid, 0.250

mole of KH2PO4, and enough water to make 0.500 L of solution.

114. Draw a curve similar to that shown in Figure 14.23 for a series of solutions of NH3. Plot

[OH?] on the vertical axis and the total concentration of NH3 (both ionized and nonionized

NH3 molecules) on the horizontal axis. Let the total concentration of NH3 vary from 1 ?

10?10 M to 1 ? 10?2 M.

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