1 AlCl3 + Na2О →

1 AlCl3 + Na2О →

  • A=Na2S

    B= H2S

    C= PbS

    Na2S+2HCl=2NaCl +H2S

    H2S + Pb(NO3)2= PbS+ 2 HNO3

  • 1) Na2S + 2HCl = 2NaCl + H2S;
    2) Pb(NO3)2 + H2S = PbS + 2HNO3.
    Тогда:
    А — Na2S
    B — H2S
    C — PbS