you are given mixtures containin gthe following compounds. Which compound in each pair could be separated by stirring the solid mixture with water? (A) NaOH and Ca (OH) 2 (B) MgCl2 and MgF2 (C) Agl and KI (D) NH4Cl and PbCl2

(A) NaOH and Ca (OH) 2: Ca (OH) 2

(B) MgCl2 and MgF2: MgF2

(C) Agl and KI: AgI

(D) NH4Cl and PbCl2: PbCl2

Explanation:

We need to see the solubility in water, at similar temperatures, for each compound and see which one is less soluble than the other:

NaOH: 1000 g/L (25 °C)

Ca (OH) 2: 1.73 g/L (20 °C)

MgCl2: 54.3 g/100 mL (20 °C)

MgF2: 0.013 g/100 mL (20 °C)

Agl: 3*10-7g/100mL (20 °C)

KI: 140 g/100mL (20 °C)

NH4Cl: 383.0 g/L (25 °C)

PbCl2: 10.8 g/L (20 °C)

After the comparison made we can conclude that the less soluble, after saturation of water, will precipitate first.