Question

Question #7ba2d

Answer 1

`i.` `Ba^(2+) + CO_3^(2-) rarr BaCO_3(s)darr`

`ii.` `Ca^(2+) + HPO_4^(2-) rarr CaHPO_4(s)darr`

Explanation:

All carbonates are insoluble (except for the obvious exceptions, which are?). Calcium biphosphate is about as soluble as a brick (`< 20 xx 10^(-3) g*L^-1`).