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Al+2H3PO4 ----->Al3+ +2 PO4 3- + 3H2
Al+H2SO4 ---> Al3+ + SO4 2- + H2
Fe2(SO4)3 ----> 2Fe3+ + 3SO4 2-
Ca(NO2)2 ---->Ca2+ + 2NO2-
3CaO +2 H3PO3 -----> 3Ca 2+ + 2PO4 3- +3 H2O
Ca(OH)2 +2 HCl ---->Ca 2+ +2Cl- +4H2O
2Al(OH)3 + 3H2SO4 ----> 2Al 3+ + 3SO42- +6H2O