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Conclusion:

a. Formula of Precipitates

b. Molecular Formulas

CuCl₂​(aq)+2NaI(aq)->2CuI₂(s)+2NaCl(aq)

CoCl_2​(aq)+Na₂​CO₃​(aq)->CoCO₃​(s)+2NaCl(aq)

CuCl₂​(aq)+Na₂​CO₃​(aq)->CuCO₃​(s)+2NaCl(aq)

2AlCl₃​(aq)+3Na_2​CO₃​(aq)->Al₂​(CO₃​)₃​(s)+6NaCl(aq)

BaCl_2​(aq)+Na₂​CO₃​(aq)->BaCO₃​(s)+2NaCl(aq)

NiCl₂​(aq)+Na₂​CO₃​(aq)->NiCO_3​(s)+2NaCl(aq)

3CoCl₂​(aq)+2Na_3​PO₄​(aq)->Co_3​(PO₄​)₂​(s)+6NaCl(aq)

3CuCl₂​(aq)+2Na_3​PO₄​(aq)->Cu_3​(PO₄​)₂​(s)+6NaCl(aq)

AlCl₃​(aq)+Na₃​PO₄​(aq)->AlPO₄​(s)+3NaCl(aq)

3BaCl₂​(aq)+2Na₃​PO_4​(aq)->Ba_3​(PO₄​)₂​(s)+6NaCl(aq)

3NiCl₂​(aq)+2Na₃​PO₄​(aq)->Ni₃​(PO_4​)₂​(s)+6NaCl(aq)

BaCl₂​(aq)+Na₂​SO₄​(aq)->BaSO₄​(s)+2NaCl(aq)

CoCl_2​(aq)+2NaOH(aq)->Co(OH)₂​(s)+2NaCl(aq)

CuCl₂​(aq)+2NaOH(aq)->Cu(OH)_2​(s)+2NaCl(aq)

AlCl₃​(aq)+3NaOH(aq)->Al(OH)₃​(s)+3NaCl(aq)

BaCl₂​(aq)+2NaOH(aq)->Ba(OH)₂​(s)+2NaCl(aq)

NiCl₂(aq)+2NaOH(aq)->Ni(OH)₂(s)+2NaCl(aq)