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Salt of Weak Acid and Strong Base

The pH of 1 M...

Question

The pH of 1 M $C H_{3} C O O N a$ solution in water will be nearly: $(p K_{a} f o r C H_{3} C O O H = 4.74)$

12.37

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11.37

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7.37

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9.37

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Solution

The correct option is D 9.37
$C H_{3} C O O N a + H_{2} O ⇌ C H_{3} C O O H + N a O H$
Mixture of weak acid and strong base.
$p H = 7 + \frac{1}{2} (p K_{a} + l o g C) p H = 7 + \frac{1}{2} (4.74 + l o g (1)) p H = 7 + \frac{4.74}{2} p H = 7 + 2.37 p H = 9.37$

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p H

100 m L

0.2 M

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100 m L

0.2 M N a O H

p K_{a} f o r C H_{3} C O O H = 4.74

C H_{3} C O O N a

(K_{a} = 1.8 \times 10^{- 5})

l o g (1.8) = 0.26

p K_{a}

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p H

100 m L

0.2 M

C H_{3} C O O H

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p K_{a} f o r C H_{3} C O O H = 4.74

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(p K_{a} f o r C H_{3} C O O H = 4.74)

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