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Electrolysis and Electrolytes

pH of 0.1 M C...

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pH of 0.1 M CH3COOH solution is 3 at 25 degree celcius . if limiting molar conductivity of CH3COO- and H+ are 40 and 350 S cm2 mol-. the molar conductance at 25 degree for 0.1M CH3COOH

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C H_{3} C O O H

solution is 3 at

25^{o} C .

If limiting molar conductivity of

C H_{3} C O O^{-}

H^{+}

350 S c m^{2} m o l^{- 1}

. The molar conductance (in

S c m^{2} m o l^{- 1}

25^{o} C

C H_{3} C O O H

Q. The specific conductance of a

0.01 M

solution of acetic acid at

298 K

1.65 \times 10^{- 4}

{o h m}^{- 1}

{c m}^{- 1}

. The molar conductance at infinite dilution for

H^{+}

{C H}_{3} C O O^{-}

349.1 {o h m}^{- 1}

{c m}^{2} {m o l}^{- 1}

40.9 {o h m}^{- 1}

{c m}^{2} {m o l}^{- 1}

respectively.
Calculate:

(i) Molar conductance of the solution.
(ii) Degree of dissociation of

{C H}_{3} C O O H

.
(iii) Dissociation constant for acetic acid.

Q. Specific conductance of 0.1 M

C H_{3} C O O H

^{0}

3.9 \times 10^{- 4} o h m^{- 1} c m^{- 1}

λ^{\infty} (H_{3} O^{+})

λ^{\infty} (C H_{3} C O O^{-})

^{0}

C are 349.0 and

41.0 o h m^{- 1} c m^{2} m o l^{- 1}

respectively, degree of ionisation of

C H_{3} C O O H

at the given concentration is __________.

Q. The molar conductivity of acetic acid at infinite dilution is 390.7 and for 0.1 M acetic acid solution is 5.2 mho cm

^{2}

^{- 1}

. The degree of dissociation of 0.1 M

{CH}_{3} COOH

Q. (a) The conductivity of 0.001

m o l L^{- 1}

C H_{3} C O O H

3.905 \times 10^{- 5} S c m^{- 1}

.
Calculate its molar conductivity and degree of dissociation

α

λ^{\circ} (H^{+}) = 349.6 S c m^{2} m o l^{- 1}

λ^{\circ} (C H_{3} C O O^{-}) = 40.9 S c m^{2} m o l^{- 1}

.

(b) Define electrochemical cell. What happens if external potential applied becomes greater than

E_{c e l l}^{\circ}

of electrochemical cell?

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