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Cr^3+ + 8OH^- → CrO4^2- + 4H2O + 3e^- | ·2
H2O2 + 2e^- → 2OH^- | ·3
2CrCl3 + 3H2O2 + 10NaOH → 2Na2CrO4 + 6NaCl + 8H2O
proszę :)