1.
2-3 (II) . . 2-3 3 . , . , . - . . . -.
2.
, , :
1. Ni2+ + 2OH- = Ni(OH)2¯ A13+ + 3NH3×H2O = A1(OH)3¯ + 3NH4+
2. Fe2+ + 2OH- = Fe(OH)2¯ Cr3+ + 3NH3×H2O = Cr(OH)3¯ + 3NH4+
3. Cu2+ + 2OH- = Cu(OH)2¯ Pb2+ + 2NH3×H2O = Pb(OH)2¯ + 2NH4+
4. Fe3+ + 3 OH- = Fe(OH)3¯ Be2+ + 2NH3×H2O = Be(OH)2¯ + 2NH4+
. ( ), . . ?
- , . . (/3) ( ), .
3.
2-3 , 2-3 : , , ( 2C2O4). .
1 3 () HCl, , . , ?
- . .
4.
2 , , . Na2S . . - . , , .
:
PbSO4¯ + S2- = PbS¯ + SO42-
