A mixture of 100 mmol of and 2 g of sodium sulphate was dissolved in water and the volume was made up to 100 mL. What is the mass of calcium sulphate formed and the concentration of in the resulting

Question

A mixture of 100 mmol of  and 2 g of sodium sulphate was dissolved in water and the volume was made up to 100 mL. What is the mass of calcium sulphate formed and the concentration of  in the resulting solution, respectively?

(Molar masses: , ,  respectively; )

Canvas Classes · Accepted Answer

Step 1 — Moles of each:
Moles  = 100 mmol = 0.1 mol
Moles  =  mol

Step 2 — Reaction:

is limiting (0.014 mol)

Moles  formed = 0.014 mol
Mass  =  g ✓

Step 3 — Remaining :
Moles remaining =  mol in 100 mL

But  —  is sparingly soluble.

With NaOH from reaction:

Answer: Option (3) — 1.9 g, 0.28 mol/L

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