Question

If aqueous solutions of Na2CO3 and BaCl2 are mixed, which insoluble precipitate is formed?

A. BaCO3

B. Ba2CO3

C. NaCl

D. NaCl2

E. BaO

Answer 1

Answer: A.
`BaCO_3`

Step-by-step explanation:

A double displacement reaction is one in which exchange of ions take place.

The salts which are soluble in water are designated by symbol (aq) and those which are insoluble in water and remain in solid form are represented by (s) after their chemical formulas.

The balanced chemical equation will be given as:

`Na_2CO_3(aq)+BaCl_2(aq)\rightarrow BaCO_3(s)+2NaCl(aq)`

Thus the insoluble precipitate formed is
`BaCO_3`.

Answer 2

By reaction between sodium carbonate and barium chloride you obtain barium carbonate which is an insoluble salt.

Na₂CO₃ + BaCl₂ → 2 NaCl + BaCO₃ (A)