Question

In the laboralory you are ghven the task of separating Pb and Ca ions in aqueous solution For each reagent listed below indicate if it can be used to separate the ions. Type Y for yes or N for ne, I the reagent CAN be used to separate the lons, give the formula of the precipitate. If it cannot, type No Y or N Reagent Formala of Precipitate if YES NaCo 1 NaBr 2. ,so 3.

Answer 1

1

Na₂CO₃ reacts with both Pb²⁺ and Ca²⁺ to give precipitations.

PbCO₃ and CaCO₃ both are insoluble in water.

So, Na₂CO₃ can not be used .

2.

NaBr reacts with Pb²⁺ to give precipitation of PbBr₂.

But CaBr₂ is soluble in water.

So, NaBr can be used to separate Pb²⁺ and Ca²⁺ ions.

3.

K₂SO₄ reacts with both Pb²⁺ and Ca²⁺ to give precipitation of both PbSO₄ and CaSO₄.

Therefore, K₂SO₄ can not be used to separate Pb²⁺ and Ca²⁺ ions.