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Henderson Hassleback Equation

pH of 0.1 M N...

Question

pH of $0.1 M N a_{2} H P O_{4}$ and $0.2 M N a H_{2} P O_{4}$ are respectively : $(p K_{a}) for H_{3} P O_{4}$ are 2.2, 7.2 and 12.0

A

4.7, 9.6

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B

9.6, 4.7

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C

4.7, 5.6

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D

5.6, 4.7

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Solution

The correct option is B 9.6, 4.7
For $N a_{2} H P O_{4}, p H = \frac{p K_{a_{2}} + p K_{a_{3}}}{2}$
$= \frac{7.2 + 12}{2} = 9.6$
For $N a H_{2} P O_{4}, p H = \frac{p K_{a_{1}} + p K_{a_{2}}}{2}$
$= \frac{2.2 + 7.2}{2} = 4.7$

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