Question

If Na₂CO₃ and CaCl₂ are both dissolved into the same solution, what will precipitate?

a.) CaCO₃
b.) Ca(CO₃)2
c.) Ca₂CO₃
d.) Ca₂(CO₃)₂

Answer 1

CaCO₃ (a) will precipitate.

Step-by-step explanation:

If Na₂CO₃ and CaCl₂ are both dissolved into the same solution, CaCO₃ (a) will precipitate. According to the solubility rules, all carbonates, except for those of potassium, sodium, and ammonium, are insoluble. CaCO₃ is an example of an insoluble carbonate, so it will form a precipitate when Na₂CO₃ and CaCl₂ are dissolved together.