Question

Name a salt prepared by precipitation reaction. What property must it exhibit?

Answer 1

Preparing insoluble barium sulfate salt.

• Barium sulfate salt is made of $B{a}^{2+}$ ions and $S{O}_4^{2-}$ ions.
• So, we have to prepare two soluble salts solutions of which one contains $B{a}^{2+}$, its positive metal ions and the other contains the $S{O}_4^{2-}$, its negative non-metal ions.
• These two ions will react and form precipitation as barium sulfate salt.

$B{a}^{2+}\left(aq\right)+S{O}_4^{2+}\left(aq\right)\to BaS{O}_4\left(s\right)$

• The precipitate of barium sulfate salt(residue) is gathered using a filter funnel, rinsed with distilled water to remove any impurities and dried. The filtrate contains the spectator ions which remained unchanged in the reaction.