What is the pH of a 0.485 M ammonia solution?
Ammonia, 
, is a weak base with a 
value of 
.
a)What is the pH of a 0.485 
ammonia solution?
Express your answer numerically to two decimal places.
b)What is the percent ionization of ammonia at this concentration?
Express the percentage numerically to three significant figures.Assignment 29 Ch.16Homework Answers
Given Kb = 1.8x10-5
1.8x10-5 = x2 / 0.485-x
x = [OH-] = 0.0029 M
pOH = -log (OH-)= 2.53
pH = 14 - 2.53 = 11.47
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