Question

3 задание нужно решить )

Answer 1

Cr2S3->Cr2(SO4)3->Cr(OH)3->Na3[Cr(OH)6]->NaCrO2->CrCl3

Cr2S3 + 3 H2SO4 = Cr2(SO4)3 + 3 H2S

Cr2(SO4)3 + 6 NaOH =  2 Cr(OH)3 + 3 Na2SO4

Cr(OH)3 + 3 NaOH = Na3[Cr(OH)6]

Na3[Cr(OH)6] = NaCrO2 + 2 NaOH + 2 H2O

NaCrO2 + 4 HCl = NaCl + CrCl3 + 2 H2O

NaCrO2 + 3 NaCl + 2 H2O = CrCl3+4 NaOH