Cr2(SO4)3 + Br2 + NaOH = Na2CrO4 + NaBr + Na2SO4 + ...
ZnS+HNO3=Zn(NO3)2+SO2+NO+...
уравнять ионно-электронным методом
Cr3+ + 8OH- - 3e --> CrO42- + 4H2O | 2 Br2 + 2e --> 2Br- | 3 Cr2(SO4)3 + 3Br2 + 16NaOH --> 2Na2CrO4 + 6NaBr + 3Na2SO4 + 8H2O
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Cr3+ + 8OH- - 3e --> CrO42- + 4H2O | 2
Br2 + 2e --> 2Br- | 3
Cr2(SO4)3 + 3Br2 + 16NaOH --> 2Na2CrO4 + 6NaBr + 3Na2SO4 + 8H2O