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3K₂O + 2H₃PO₄ --> 2K₃PO₄ + 3H₂O
6KOH + 2H₃PO₄ --> 2K₃PO₄ + 6H₂O
12KOH + P₄O₁₀ --> 4K₃PO₄ + 6H₂O
6K₂O + P₄O₁₀ --> 4K₃PO₄
b) Ca + 2HNO₃ --> Ca(NO₃)₂ + H₂
CaO + 2HNO₃ --> Ca(NO₃)₂ + H₂O
Ca(OH)₂ + 2HNO₃ --> Ca(NO₃)₂ + 2H₂O
Ca(OH)₂ + N₂O₅ --> Ca(NO₃)₂ + H₂O
CaO + N₂O₅ --> Ca(NO₃)₂
c) 2Fe + 3H₂SO₄ --> Fe₂(SO₄)₃ + 3H₂
Fe₂O₃ + 3H₂SO₄ --> Fe₂(SO₄)₃ + 3H₂O
2Fe(OH)₃ + 3H₂SO₄ --> Fe₂(SO₄)₃ + 3H₂O
2Fe(OH)₃ + 3SO₃ --> Fe₂(SO₄)₃ + 3H₂O
Fe₂O₃ + 3SO₃ --> Fe₂(SO₄)₃
d) 3Ca + 2H₃PO₄ --> Ca₃(PO₄)₂ + 3H₂
3CaO + 2H₃PO₄ --> Ca₃(PO₄)₂ + 3H₂O
3Ca(OH)₂ + 2H₃PO₄ --> Ca₃(PO₄)₂ + 6H₂O
6Ca(OH)₂ + P₄O₁₀ --> 2Ca₃(PO₄)₂ + 6H₂O
6CaO + P₄O₁₀ --> 2Ca₃(PO₄)₂
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