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Question

An oxyacid of phosphorus has the following properties: The complex neutralisation of the acid with sodium hydroxide solution given an aqueous solution of sodium ions and oxy-acid anions in the ratio 2:1. When a solution of the acid is warmed with silver nitrate solution, metallic silver is deposited.


pH 0.01 M solution of the sodium salt of this acid formed (assume pKa1=2x) is___________.

A
6+2x
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B
6-2x
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C
6-x
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D
6+x
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Solution

The correct option is D 6+x
As we know,
pH=7+pKa2+logC2
pH=7+2x2+log[0.01]2
=7+2x21=(6+x)

Therefore pH 0.01 M solution of the sodium salt of this acid formed is (6+x)

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