Suppose a metal spoon is to be electroplated with copper. We will use copper sulphate solution as the electrolyte. When electricity is passes through it copper ions move towards the cathode. What will happen to the sulphate ions which are negatively charged?

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Solution

It remains in the solution. The cathodic and anodic reactions are
Cathode reaction: Cu²⁺(aq) + 2e^- → Cu(s)

Anode reaction: 2H₂O(l) → O₂(g) + 4H⁺(aq) + 4e^-

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During electroplating the copper plate on the negative terminal gains weight and positive terminal having the copper plate loses weight. If this journey happens continuously what will happen to the positive copper plate as it will loose all the copper ions it contains? Will it dissolve into copper sulphate solution?

Assertion: Upal observed that copper is deposited on the negative electrode connected to the terminal of the battery. Kavya performed the same experiment but she replaced the copper electrode with a carbon electrode and still observed copper is deposited over carbon rod.

Reason: Copper sulphate solution dissociates into copper and sulphate ions when electricity is passed through dilute copper sulphate solution and this free copper ions deposit on the carbon rod.

Q. An electric current is passed through silver nitrate solution using silver electrodes.

15.28

g of silver was found to be deposited on cathode. What will be the weight of copper deposited on cathode if same amount of electricity is passed through copper sulphate solution using copper electrodes?

If plus sign (+) denotes the positive electrode and minus sign (-) denotes the negative electrode, then which of the following statement is correct for an iron spoon to be copper-plated ?
(a) Iron spoon (+), copper plate (-), Iron sulphate electrolyte
(b) Iron spoon (-), copper plate (+), Iron sulphate electrolyte
(c) Copper plate (-), Iron spoon (+), Copper sulphate electrolyte
(d) Copper plate (+), Iron spoon (-), Copper sulphate electrolyte

Assertion: When an electric current is passed through the copper sulphate electrolyte, the impure copper anode gradually dissolve and pure copper is deposited on the cathode.

Reason: Pure metals are deposited in electroplating techniques.

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Suppose a metal spoon is to be electroplated with copper. We will use copper sulphate solution as the electrolyte. When electricity is passes through it copper ions move towards the cathode. What will happen to the sulphate ions which are negatively charged?

It remains in the solution. The cathodic and anodic reactions are Cathode reaction: Cu2+(aq) + 2e- → Cu(s) Anode reaction: 2H2O(l) → O2(g) + 4H+(aq) + 4e-

It remains in the solution. The cathodic and anodic reactions are
Cathode reaction: Cu²⁺(aq) + 2e^- → Cu(s)

Anode reaction: 2H₂O(l) → O₂(g) + 4H⁺(aq) + 4e^-