CrCl(3)-->CrOHCl(2)-->Cr(OH)(3)--->Cr(2)O(3)--tC-->KCrO(2)--->Cr(2)(SO)(4)-->Cr((HSO)(4))(3)
CrCl3+H2O=CrOHCl2
CrOHCl2+2KOH=Cr(OH)3+2KCl
2Cr(OH)3+NH3=Cr2O3+HNO3+4H2
Cr2O3+2KOH=2KCrO2+H20
2KCrO2+H2SO4=Cr2SO4+2KOH+O2