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Mg(2+) + 2OH(-) + 2H(+) + 2Cl(-) ->Mg(2+) + 2Cl(-) + 2H2O
2OH(-) + 2H(+)->2H2O/:2
OH(-) + H(+) ->H2O
2.Ba+2HCl->BaCl2+H2
Ba + 2H(+) + 2Cl(-) ->Ba(2+) + 2Cl(-) + H2
Ba + 2H(+) ->Ba(2+) + H2
3.Fe2O3+3H2SO4->Fe2(SO4)3+3H2O
Fe2O3 + 6H(+) + 3SO4(2-) ->2Fe(3+) + 3SO4(2-) + 3H2O
Fe2O3 + 6H(+) ->2Fe(3+) + 3H2O
4.2AgNO3+H2S->Ag2S+2HNO3
2Ag(+) + 2NO3(-) + 2H(+) + S(2-) ->Ag2S + 2H(+) + 2NO3(-)
2Ag(+) + S(2-) ->Ag2S
5.3CaCl2+2Na3PO4->Ca3(PO4)2+6NaCl
3Ca(2+) + 6Cl(-) + 6Na(+) + 2PO4(3-) ->Ca3(PO4)2 + 6Na(+) + 6Cl(-)
3Ca(2+) + 2PO4(3-) ->Ca3(PO4)2