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2. reakcja metali z kwasami
3. reakcje tlenków metali z kwasami
I to są te sole:
a) siarczek sodu
2NaOH + H2S---->Na2S + 2H2O
2Na + H2S---->Na2S + H2
Na2O + H2S---->Na2S + H2O
b) fosforan (V) wapnia
3Ca(OH)2 + 2H3PO4---->Ca3(PO4)2 + 6H2O
3Ca + 2H3PO4---->Ca3(PO4)2 + 3H2
3CaO + 2H3PO4---->Ca3(PO4)2 + 3H2O