A certain buffer solution contains equal concentration of X− and HX. The Kb for X− is 10−10. The pH of the buffer is:
A
4
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B
7
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C
10
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D
14
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Solution
The correct option is A 4 For a basic buffer, Henderson equation is given by pH=14−pKb−log[salt][base]
According to question [X−]=[HX] pH=14−pKb−log[X−][HX] pH=14−(−log10−10)−log1 pH=14−10−0=4
Hence correct option is (a).