Q.

The pH of ammonium phosphate solution, if pka of phosphoric acid and pkb of ammonium hydroxide are 5.23 and 4.75 respectively, is ________.

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answer is 7.24.

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Detailed Solution

For aq. Solution of salt of weak acid with weak base, pH=12pkw+pka−pkb=7+5.232−4.752=7+2.62−2.38=7.24
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The pH of ammonium phosphate solution, if pka of phosphoric acid and pkb of ammonium hydroxide are 5.23 and 4.75 respectively, is ________.