Question

in a voltaic cell, what happens to the mass of the cathode as the reaction proceeds?
a. the mass of the electrode increases.
b. the mass of the electrode decreases.
c. the mass of the electrode stays the same.
enter the answer choice letter.

Explanation:

In a voltaic cell, reduction occurs at the cathode. During reduction, metal ions (usually from the electrolyte) gain electrons and deposit as solid metal on the cathode. For example, if we have a reaction like $\ce{Cu^{2+} + 2e^- -> Cu}$, copper ions are reduced to copper metal and deposit on the cathode, increasing its mass. So the mass of the cathode electrode increases as the reaction proceeds.

Answer:

A