cr2(so4)3+naoh	cr(oh)3+na2so4
naoh+cr(oh)3	na3[cr(oh)6]
hcl+cr(oh)3	crcl3+3h20
na3[cr(oh)6]+h202	na2cro4+naoh+h2o
h2so4+na2cro4	na2cr2o7+na2so4+h2o
k2cr2o7+kno2+h2so4	cr(so4)3+kno3+k2so4+h2o