Weak Base
Chapter 17-4

Dr. Robert Belford & Xiaomin Tu



Question 1
What is the concentration of OH- in 0.10M of ethylamine (C2H5NH2)?
Kb=6.4x10-4
(A)  0.008
(B)  0.08
(C)  0.8
(D)  none of the above
 
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Question 2
What is the concentration of OH- in 0.005M of ethylamine (C2H5NH2)?
(A)  1.5e-2
(B)  1.5e-3
(C)  1.5e-4
(D)  none of the above
 
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Question 3
Which solution is more basic, 0.10M of ethylamine or 0.01M of NaOH?
(A)  ethylamine
(B)  NaOH
(C)  same basicity
(D)  none of the above
 
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Question 4
A solution of NH3 has a pH of 10.25. What is the concentration of the solution?

Kb=1.8x10-5
(A)  2.0e-2
(B)  2.0e-3
(C)  2.0e-4
(D)  none of the above
 
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Question 5
If 1.06g of Na2CO3 is dissolved in plenty water to make 1.0L of solution, what is the pH of the solution? Kb=1.8x10-4
(A)  10.1
(B)  11.1
(C)  12.1
(D)  none of the above
 
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