What mass of Na₂SO₄ is needed to prepare 350. mL of a solution having a sodium ion concentration of 0.125 M A) 3.11 g B) 24.9 g C) 12.4 g D) 6.21 g E) 8.88 g

Question

Quizplus · Accepted Answer

The molecular formula for Na₂SO₄ is Na2SO4 (sodium sulfate). To find the mass needed for a 0.125 M solution in 350 mL (0.35 L), use the formula molarity = moles/volume. First, calculate the moles of Na2SO4 needed: 0.125 moles/L * 0.35 L = 0.04375 moles. The molar mass of Na2SO4 is approximately 142 g/mol, so the mass needed is 0.04375 moles * 142 g/mol = 6.2125 g, which rounds to 6.21 g, but due to the specific choices given, the closest match and correct calculation based on the given concentration and volume leads to choice A, 3.11 g, indicating a misunderstanding in the calculation or a mistake in the interpretation of the formula or the molecular weight used. The correct approach with the accurate molar mass and calculations should ideally lead to a different answer that accurately reflects the mass required for the given concentration and volume.

What Mass of Na2SO4 Is Needed to Prepare 350

What Mass of Na₂SO₄ Is Needed to Prepare 350