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2H2O + 2e ----> H2 + 2OH(-) |*3
2Cr + 8OH(-) + 6H2O + 6e ---> 2Cr(OH)4(-) + 6e + 3H2 + 6OH(-)
po skróceniu
2Cr + 2OH(-) + 6H2O ---> 2Cr(OH)4(-) + 3H2