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= 965 ÷ 96500 = 0,01
NaCl → Na^+ + Cl^-
k : 2H2O + 2e → 2 OH^- + H2
a : 2H2O → 4 H^+ + 4 e + O2
mol elektron = mol H^+ = 0,01
[H^+] = 0,01 ÷ 1 = 0,01 ≈ 10^-2
pH = 2