A 25.0 mL sample of 0.723 M HClO4 is titrated with a 0.273 M KOH solution. The H

Question

A 25.0 mL sample of 0.723 M HClO4 is titrated with a 0.273 M KOH solution. The H3O+ concentration after the addition of 0.00 mL of KOH is ______ M.

Is it:

a)0.723

b)0.273

c)0.0181

d)0.430

e)None of the above

The concentration of iodide ions in a saturated solution of silver iodide is ________ M.. The solubility product constant of AgI is 8.3 x 10^-17.

Is it:

a) 3.5 x 10^ -9

b) 3.0 x 10^-10

c) 1.4 x 10^ -8

d) 3.8 x 10^-11

e) 9.1 x 10 ^ -9

Calculate the pH of a solution prepared by dissolving 0.270 mol of formic acid and 0.200 mol of sodium formate in sufficient to yield 1.00 L of solution The Ka of formic acid is 1.77 x 10 ^ -4.

It is:

a) 3.622

b) 2.099

c) 10.378

d) 3.952

e) 2.307

Explanation / Answer

(1) M = 0.723 x 25.0 / 1000 = 0.0181 M . So the answer is 'c'

(2)     AgI <--------> Ag+ (aq.) + I - (aq.)

Ksp = [Ag+][I-] = S . S

S = (Ksp)1/2 = (8.3 x 10 -17)1/2 = 9.1 x 10 -9 M So, the answer is 'e'

(3) pH = pKa + Log ([salt]/[acid])

pH = 3.75 + Log (0.2/0.27) = 3.62, So, the answer is 'a'

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