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Standard XII

Chemistry

Representation of Cell

76 Two weak a...

Question

76 Two weak acid solutions HA1 and HA2 each with the same concentration and having pka values 3 and 5 are placed in contact with a hydrogen electrode (1atm, 25 degrees celsius) and are interconnected through a salt bridge. Calculate the emf of the cell.

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Two weak acid solutions $H A_{1}$ and $H A_{2}$ each with the same concentration and having pKa values 3 and 5 are placed in contact with hydrogen electrode ( 1 atm, 25 $^{0}$ C ) and are interconnected through a salt bridge. Find emf of the cell.

Q. Equinormal solution of two weak acids,

H A (p K_{a} = 3)

and

H B (p K_{a} = 5)

are each placed in contact with standard hydrogen electrode at

25^{\circ} C

. When a cell is constructed by interconnecting them through a salt bridge, find the e.m.f of the cell.

Q. A cell contains two hydrogen electrode. The negative electrode is in contact with a solution of

10^{- 6} M

hydrogen ions. The emf of the cell is

0.118

volt at

25^{\circ} C

. Calculate the concentration of hydrogen ions at the positive electrode.

Q. A hydrogen electrode placed in a solution containing sodium acetate and acetic acid in the concentration ratios of

x : y

and

y : x

has electrode potential values

E_{1}

and

E_{2}

volts, respectively, at

25^{\circ} C

. The

p K_{a}

value of acetic acid is:

Q. A cell contains two hydrogen electrodes. The negative electrode is in contact with a solution of

10^{- 6}

M hydrogen ions. The

E M F

of the cell is

0.118 V

25^{\circ} C

. The concentration of hydrogen ions at the positive electrode is:

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