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Salt of Weak Acid and Strong Base

Calculate the...

Question

Calculate the $p H$ of 0.2 M $N a O C l$ solution.
$K_{a} (H O C l) = 3.5 \times 10^{- 8}$

A

10.01

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B

12.53

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C

8.63

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D

9.53

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Solution

The correct option is A $10.01$
$N a O C l$ is a salt of weak acid $H O C l$ and strong base $N a O H$
$p K a = - l o g (K_{a}) p K_{a} = - l o g (3.5 \times 10^{- 8}) p K_{a} = (8 - 0.54) = 7.46 p H = 7 + \frac{1}{2} (p K_{a} + l o g C) p H = 7 + \frac{1}{2} (7.46 + l o g (0.2)) p H = 7 + \frac{1}{2} (7.46 - 0.7) p H = 10.38$

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Similar questions

Q. Calculate the

p H

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K_{a} (H O C l) = 3.5 \times 10^{- 8}

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Q. Calculate the pH of a solution containing

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K_{2} (H C O_{3}^{-}) = 4.8 \times 10^{- 11}]

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Salt of Weak Acid and Strong Base

Standard XII Chemistry

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