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Section 17.1 – The Common-Ion
Effect
The common-ion effect state that whenever
a weak electrolyte and a strong electrolyte
ionizes less than it would if it were alone in
solution.
Sample Exercise 17.1
What is the pH of a solution made by adding
0.30 mol of acetic acid and 0.30 mol of
sodium acetate to enough water to make
1.0L of solution?
Practice Exercise
Calculate the pH of a solution containing
0.085M nitrous acid (K = 4.5 x 10-4) and
a
0.1M potassium nitrite.
Sample Exercise 17.2
Calculate the fluoride ion concentration and
pH of a solution that is 0.20M in HF and
0.10M in HCl.
Practice Exercise
Calculate the formate ion concentration and
pH of a solution that is 0.050M in formic acid
(HCOOH; K = 1.8 x 10-4) and 0.10M in HNO .
a 3
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