Ответ:
1) Na2SO3+H2SO4=Na2So4+So2+H2o
2Na+ + SO32- +2H+ +SO42- = 2Na+ +SO42- +SO2+H2O
So32- + 2H+ = SO42- +So2+H2O
2) Pb(NO3)2 + Na2S = PbS + 2NaNO3
Na2S + Pb(NO3)2 = PbS +2 NaNO3 2Na+ + S-2 + Pb+2 + 2NO3 = PbS + 2Na+ + 2NO3-
Pb+2 + S-2 =PbS
3) позже
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Answers & Comments
Ответ:
1) Na2SO3+H2SO4=Na2So4+So2+H2o
2Na+ + SO32- +2H+ +SO42- = 2Na+ +SO42- +SO2+H2O
So32- + 2H+ = SO42- +So2+H2O
2) Pb(NO3)2 + Na2S = PbS + 2NaNO3
Na2S + Pb(NO3)2 = PbS +2 NaNO3 2Na+ + S-2 + Pb+2 + 2NO3 = PbS + 2Na+ + 2NO3-
Pb+2 + S-2 =PbS
3) позже