How many Na⁺ ion moles can be found in 250 mL of a 1.2 M solution of Na₂SO₄?
A) 0.4
B) 1.8
C) 0.3
D) 0.6
E) 1.2
IMAT 2024 · Question 38
Q38 - Concentration of solutions
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The correct answer is D) 0.6.
Moles of Na₂SO₄ = 1.2 × 0.250 = 0.3 mol. Each formula unit releases two Na⁺, so you get 0.6 mol of sodium ions.
If you got 0.3, you forgot the 2.
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