Answer to Question #113156 in General Chemistry for Beverlie

Question

1.Suppose the current flowing from a battery is used to electroplate an object with silver. Calculate the mass of silver that would be deposited by a battery that delivers 1.40 A·hr of charge. answer in g

Answer 1

The electrochemical reaction of silver is –

Ag⁺(aq) + e^- = Ag(s)

The solution can be find out by following the Faraday’s first law of electrolysis.

This law states that the mass of a substance liberated at the electrode is directly proportional to the quantity of electricity passed through the electrolyte.

m = E x Q

m - mass of substance deposited or liberated;

E - electrochemical equivalent;

Q - quantity of current.

m = M x (I x t / Z x F) = 108 g/mol x (1.4 C/s x 3600 s / 1 x 96500 C/mol) = 5.641 g