# Question #f364e

Mar 1, 2017

Not really, unless there are extremes.

#### Explanation:

The plating is only dependant on the number of copper ions that lose their charge by gaining electrons from the cathode:
$C {u}^{2 +} \left(a q\right) + 2 {e}^{-} \to C u \left(s\right)$

And the number of electrons is only dependant on current and time.

But :
If current is very low (or zero), and $C {u}^{2 +}$ concentration is high, some zinc from the brass alloy may exchange charge with the copper ions: $C {u}^{2 +} + Z n \to C u + Z {n}^{2 +}$

And if the concentration of $C {u}^{2 +}$ is very low and the current is high, hydrogen may form at the cathode, which will lower the copper gain.