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pH of a Solution

Select correc...

Question

Select correct statement for 50ml 0.1M $H_{2} A (a q .)$ solution ;
${K_{a}}_{1} = 10^{- 5}; {K_{a}}_{2} = 10^{- 8}$

[H^{+}] = 2 [A^{2 -}]

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pH of 0.1M

H_{2} A

solution is 3

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In above

H_{2} A

solution when 5 milimoles of NaHA are added then pH increases by 2 units.

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50ml of 0.1M NaOH required to neutralised completely 50ml of 0.1M

H_{2} A

solution

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Solution

The correct option is B pH of 0.1M $H_{2} A$ solution is 3
$H_{2} A 0.005 0.1 {K_{a}}_{1} = 0.1005 = \frac{0.1005 \times 10^{- 2}}{50} = 0.00002 P h - log (0.00002) = 4.7$

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