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Cr(OH)3 + 3 NaOH ---> [Cr(OH)6](3-) + 3Na(+)
2[Cr(OH)6](3-) + 3H2O2 ---> Cr2O7(2-) + 7H2O + 4OH(-)
2CrO4(2-) + H2SO4 -----> Cr2O7(2-) + H2O + SO4(2-)
Cr2O7(2-) + 14HCl -----> 2Cr(3+) + 3Cl2 + 7H2O + 8Cl(-)
2) NaOH
3) H2O2
4) H2SO4(stez.)
5) HCl