Electroplating efficiency. Nickel was electrolytically plated onto a carbon electrode from a bath containing 290 g/L NiSO₄ ∙ 6H₂O, 30 g/L B(OH)3, and 8 g/L NaCl at - 1.2 V vs. Ag | AgCl. The most important side reaction is reduction of H+ to H2. In one experiment, a carbon electrode weighing 0.477 5 g before deposition weighed 0.479 8 g after 8.082 C had passed through the circuit. What percentage of the current went into the reaction Ni²⁺ + 2e^-→ Ni(s)?