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Reactions of Aryl Amines (Diazo Salts)

The dissociat...

Question

The dissociation constant of a weak acid HCOOH is 10–4. A solution is made containing 6.8 g HCOONa for every 46 g HCOOH. The pH of the solution is nearly equal to

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H C O O H ⇌ H C O O^{-} + H^{+}; K_{a} = 1.7 \times 10^{- 2}

[H^{+}]

0.1 M

H C O O H

0.05 M

H C O O N a

m o l e s

H C O O N a

1 L

0.1 M

H C O O H

p H

3.4

K_{a}

H C O O H = 2 \times 10^{- 4}

25^{o} C,

(K_{a})

H A

(K_{b})

A^{-} .

pH of 0.1 M weak acid solution is 4. What is the dissociation constant of the acid ?

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