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K2CO3 + 2AgNO3 -------> Ag2CO3↓ + 2KNO3
2K (+) + CO3 (2-) + 2Ag (+) + 2NO3 (-) -------> Ag2CO3↓ + 2K (+) + 2NO3(-)
CO3 (2-) + 2Ag (+) -------> Ag2CO3↓
Na2SO4 + CaCl2 ----> CaSO4↓ + 2NaCl
2Na(+) + SO4 (2-) + Ca (2+) + 2Cl(-) ----> CaSO4↓ + 2Na(+) + 2Cl(-)
SO4 (2-) + Ca (2+) ----> CaSO4↓