1)Zn(OH)2+2KOH=K2[Zn(OH)4]
2)Cr2(SO4)3+7H2O+3K2S2O6(O2)=K2Cr2O7+4KHSO4+5H2SO4
K2Cr2O7+2KOH=2K2CrO4+H2O
K2CrO4+BaNO3=Ba2CrO4+2KNO3
1)Zn(OH)2+2KOH=K2[Zn(OH)4]
2)Cr2(SO4)3+7H2O+3K2S2O6(O2)=K2Cr2O7+4KHSO4+5H2SO4
K2Cr2O7+2KOH=2K2CrO4+H2O
K2CrO4+BaNO3=Ba2CrO4+2KNO3