QUIZ 4: April 30, 2002
KEY SHOW YOUR WORK
(Answers without work may get no credit)
Kw= [H3O+][OH-] = 1.0 x 10-14 at 25 ºC
1. In the following pairs, which of the following is the stronger acid? Circle the stronger acid of
each pair. (3 points)
HCl or CH3COOH H2O or HNO3 H2S or H2SO4
2. In the following pairs, which of the following is the stronger base? Circle the stronger base
of each pair. (3 points)
NaHSO3or NaOH Na2S or H2ONa2O or NaHCO3
3. a) Calculate [OH-] in a solution at 25 ºC whose [H3O+] concentration is 5.3x10-2.
(4 points)
[OH-] = Kw/[H3O+] = 1.0 x 10-14 / 5.3 x 10-2= 1.9 x 10-13 M
b) Is this solution acidic, basic, or neutral? (2 points)
