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Q.

Equivalent conductance of 1 M propanoic acid is $10 {ohm}^{- 1} {cm}^{2} {eq}^{- 1}$ and that at infinite dilution $200 o h m^{- 1} c m^{2} e q^{- 1} .$ pH of the ethanoic acid solution is

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a

7

b

1.3

c

6.8

d

3.3

answer is C.

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Detailed Solution

$λ_{e} = 10$

$λ_{\infty} = 200$

$PH = ?$

$N = 1 \times M = M = 1$

$α = \frac{λ}{λ_{\infty}} = \frac{10}{200} = 0.025$

$N = [H^{+}] = Cα$

$= 1 \times 5 \times 10^{- 2}$

PH=2-log.5

=1.3

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Equivalent conductance of 1 M propanoic acid is 10 ohm-1cm2eq-1and that at infinite dilution 200ohm-1cm2eq-1.pH of the ethanoic acid solution is