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Question
A buffer solution was prepared by dissoving 0.02 mol propionic acid and 0.015 mol sodium propionate in enough water to make 1.00L of solution. (Ka for propoinic acid is 1.34×10−5). What is the pH of the buffer?
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Solution
The correct option is B 4.75
A solution that resists change in pH value upon addition of a small amount of strong acid or base (less than 1 %) or when the solution is diluted is called buffer solution.
Acidic buffer solution: An acidic buffer solution consists of a solution of a weak acid and its salt with a strong base.
For acidic buffer solution, pH=pKa+log[salt][acid]
pH=−log(1.3×10−5)+log0.0150.02=−log(1.34×10−5)+log34=4.75
A solution that resists change in pH value upon addition of a small amount of strong acid or base (less than 1 %) or when the solution is diluted is called buffer solution.
Acidic buffer solution: An acidic buffer solution consists of a solution of a weak acid and its salt with a strong base.
For acidic buffer solution, pH=pKa+log[salt][acid]
pH=−log(1.3×10−5)+log0.0150.02=−log(1.34×10−5)+log34=4.75
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