Chemistry Question

Question

1.00 mole of sodium sulfate (Na2SO₄) is dissolved in 10.0 L of water. What is the concentration of potassium ions in the resulting solution?

1. A. 0.200 M
2. B. 0.500 M
3. C. 0.400 M
4. D. 0.100 M

Answer 1

Na₂SO₄ ==> 2Na⁺ + SO₄^2-

1 mol/10 L = 0.1 mol/L

0.1 mol/L Na₂SO₄ x 2 mol Na⁺/mol Na₂SO₄ = 0.2 M Answer (A) if it asked for concentration of sodium ion

(guessing potassium ion is a misprint/error)

Answer 2

1 mole Na₂SO₄/ 10 L = 0.1 M , Na⁺¹ concentration would be 2 mol Na¹⁺/ 10 L = 0.2 M

there are no potassium ions present