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Table 4 Reactions of copper in alkaline solution (21)

From: Duplication of uniqueness: electrotyping in nature printing and its application in contemporary art

Reaction

Nernst equilibrium potential vs. SHE, U0

Nernst equilibrium potential vs. SHE, U0

pH = 10.60

2Cu + H2O Cu2O + 2H+ + 2e

0.47–0.059 pH

− 0.16

Cu + H2O CuO + 2H+ + 2e

0.57–0.059 pH

− 0.06

Cu2O + H2O 2CuO + 2H+ + 2e

0.67–0.059 pH

+0.04

Ag ↔ Ag+ e

0.80 + 0.059 log[Ag+]

~ + 0.50 ([Ag*] ~ 10−5 M

2Ag + H2O Ag2O + 2H+ + 2e

1.17–0.059 pH

+0.54