Polyprotic Acids
Chapter 17-5

Dr. Robert Belford & Xiaomin Tu



Question 1
What is the pH of a 0.002M solution of H2CO3? Ka1=4.3x10-7, Ka2 = 5.6x10-11
(A)  2.53
(B)  3.53
(C)  4.53
(D)  none of the above
 
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Question 2
What is the concentration of CO32- ion in the solution in Q1?
(A)  4.5e-10M
(B)  5.6e-11M
(C)  7.2e-12
(D)  none of the above
 
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Question 3
What is the pH of a 0.05M of sulfurous acid (H2SO3)? Ka1=1.7x10-2, Ka2=6.4x10-8
(A)  0.66
(B)  1.66
(C)  2.66
(D)  none of the above
 
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Question 4
What is the concentration of SO32- ion in the solution in Q3?
(A)  6.4e-8
(B)  7.2e-9
(C)  5.6e-10
(D)  none of the above
 
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Question 5
What is the concentration of a sample solution of H2CO3 that has a pH = 4.50?
(A)  0.012M
(B)  0.0023M
(C)  0.0099M
(D)  none of the above
 
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