Answer to Question #349070 in General Chemistry for baylee

Question

What is the molarity of Na+(aq) in a solution containing 0.250 M Na2SO4 (aq)?

Answer 1

Na₂SO₄ => 2Na⁺ + SO₄^2-

Dissociation of 1 mol of Na₂SO₄ results in the formation of 2 mol of Na⁺. therefore, the molar concentration of Na⁺ is twice that of Na₂SO₄ :

1mol Na₂SO₄ —> 2mol Na⁺

0,25 M Na₂SO₄ —> X

X = 0,25 * 2 / 1 = 0,5 M Na⁺

Answer: 0,5 M