Q. 20

# Two voltameters,

Answer :

Given-
Mass of salt deposited, m = 1 g

Current, i = 2 A

Time, t = 1.5 hours = 5400 s

Atomic weight of silver is 107.9 g mol–1.

For the trivalent metal salt

Equivalent mass = 13 times its Atomic weight

The E.C.E of the salt

Z=Equivalent mass

96500=Atomic weight 3×96500

(a) Using the formula, from faraday’s law of electrolysis – where,

m = the mass of the substance deposited on the electrode

z=electrochemical equivalence

i=current passing

t=time taken

Now, 1 gram is deposited and the element is trivalent metal    (b)Now the relation between equivalent mass and mass deposited on plates is given by – Where

E1 is the equivalent mass of the trivalent metal

E2 is the equivalent mass of the silver

m1 is the mass of trivalent material deposited

m2 is the mass of the silver deposited

Atomic weight of silver is 107.9 g mol–1.

Substituting to calculate the mass deposited –  Rate this question :

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