Chem 12
Acid/Base Ka Worksheet
Name:________________
1) Write the conjugate acid of each of the following:
a) NO2-
________
b) HCO3- ________
c) HPO42- _________
e) H2SO4 ________
d) OH-
f) CH3NH2 ________
_________
2) Write the conjugate base of each of the following:
a) HF
________
b) HCO3- ________
_________
e) HPO42- ________
d) N2H5+ _________
f) (CH3)2NH2+ _____
c) NH3
3) Which member of each of the following pairs is the stronger acid?
a) H2O2 or HSO3- _______________
c) HCO3- or HSO4- _______________
b) H2PO4- or HS- ________________
d) CH3COOH or HCOOH __________
4) The value of Ka for H2S
H+ + HS- is 1.0 x 10-7.
What is the value of [H+] in a 0.050 M solution of H2S?
5) What is the percentage dissociation of H2S in problem #4?
(percent dissociation = [H+]equilbrium / [H2S]initial x 100%)
6) The value of Ka for H2O2
H+ + HO2- is 2.4 x 10-12.
What is the pH of a 0.20 M solution of H2O2?
7) What is the percentage dissociation of H2O2 in problem #6?
8) The pH of a 0.010 M solution of HBr is 2.00. What is Ka for HBr?
9) A 0.010 M solution of HCN is 0.020% ionized (dissociated). What is the Ka for HCN?
10)
A 0.40 M solution of HClO3 is 0.027% ionized. What is the Ka for HClO3?
11)
A 0.0100 M solution of HOBr has a pH of 5.343. What is Ka for HOBr?