Question

When concentrated )" align="absmiddle" class="latex-formula"> is added to $Na_{2}HPO_{4}$, a white precipitate forms that is 38.7% Ca by mass. Write a net ionic equation representing the probable reaction that occurs.

Answer 1

Molecular equation: 

Na2CO3 (aq) + CaCl2 (aq) → CaCO3 (s) + 2 NaCl (aq) 


Ionic equation: 

2 Na⁺ (aq) + CO3²⁻ (aq) + Ca²⁺ (aq) + 2 Cl⁻ (aq) → CaCO3 (s) + 2 Na⁺ (aq) + 2 Cl⁻ (aq) 


Net ionic equation: 

CO3²⁻ (aq) + Ca²⁺ (aq) → CaCO3 (s)