Question

Question #198a3

Answer 1

We exploit the stoichiometric reaction............

Explanation:

`Ba(NO_3)_2(aq) + Na_2CO_3(aq) rarr BaCO_3(s)darr+2NaNO_3(aq)`

Most carbonates are insoluble; the alkaline earth carbonates are especially insoluble. `BaCO_3` has `K_(sp)=2.58xx10^-9` (these data should have been supplied with the question).

Addition of stoichiometric sodium carbonate should suffice.

`"Moles of barium nitrate"=120xx10^-3*Lxx0.0500*mol*L^-1=6xx10^-3*mol.`

And thus we need.....................................................................

`6xx10^-3*molxx105.99*g*mol^-1=635*mg` with respect to `"sodium carbonate"`.