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Question

H2O+H3PO4H3O++HPO24 Where, pK1=2.15 and pK2 = 7.2

Then, pH of 0.01 M NaH2PO4 is:

A
9.35
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B
4.675
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C
2.675
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D
7.35
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Solution

The correct option is A 4.675
NaH2PO4 is the salt produced at the 1st step neutralisation of H3PO4.

The salt undergoes hydrolysis and pH=12pk1+12pk2=12×2.15+12×7.2=4.675

So, the correct answer is B

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