Question

A direct current is applied to a solution of CaBr2, and a gas is evolved from one of the electrodes. a. Is the gas evolved at the anode or the cathode? b. W hat is the gas?

Answer 1

a) cathode

b) br2

Step-by-step explanation:

a) the reaction will always form a precipitate at the cathode because that is where the electrons will meet the element with the higher standard reduction potential.

b) ca + 2br- -> ca2+ + 2br br2 is the precipitate formed