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1. K2CO3 + H3PO4 = K3PO4 + H2O + CO2          
2. CaO + H2O → Ca(OH)2
3. 2H2O = 2H2 + O2           
4. Ca(OH)2 + H3PO4 → Ca3(PO4)2 + H2O
5. CaO + 2HCl → CaCl2 + H2O           
6. FeCl3 + NaOH → Fe(OH)3 + NaCl"​
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