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pH of a Solution

oKa of acetic...

Question

$o K_{a}$ of acetic acid is $4.74$ . The concentration of $C H_{3} C O O N a$ is $0.01$ M. The pH of $C H_{3} C O O N a$ solution is?

10.37

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8.37

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7.0

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4.37

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Solution

The correct option is C $8.37$
$C H_{3} C O O N a$ is a salt of weak acid $C H_{3} C O O H$ and strong base $N a O H$ .This is the case of salt hydrolysis.
pH = 7 + $\frac{1}{2} p K a$ + $\frac{1}{2} (l o g c)$
pH = 7 + $\frac{1}{2} \times 4.74$ + $\frac{1}{2} (l o g (0.01))$
pH = 7 + 2.37 - 1 = 9.37 - 1 = 8.37

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(C H_{3} C O O N a)

C H_{3} C O O H + (C H_{3} C O O N a

C H_{3} C O O H

p K_{a}

C H_{3} C O O H

C H_{3} C O O N a

C H_{3} C O O N a

C H_{3} C O O H

p K_{a} = 4.74

p H

(p K_{a} = 4.74)

p H = 5.74

C H_{3} C O O H

C H_{3} C O O N a

0.01 M

C H_{3} C O O H

K_{a} (C H_{3} C O O H) = 1.8 \times 10^{- 5}

l o g (1.8) = 0.26

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