Question

Which is more concentrated with respect to sodium ions, 50.0 g of NaCl dissolved in 500.0 mL of solution or 59.0 g of Na2SO4 in 500.0 mL of solution? a They are equal in concentration b The NaCl solution described c The Na2SO4 solution described Question 12 (1 point) What percentage of sodium sulfate molecules are separated when placed in water? a 50% b 100% c 10% d 80%

Answer 1

Answer:

b) The NaCl solution described

Explanation:

First we calculate the number of moles for each compound:

moles = mass / molecular weight

moles of NaCl = 50 / 58.5 = 0.854 moles

moles of Na₂SO₄ = 59 / 142 = 0.415 moles

In the first solution we have:

0.854 moles of NaCl which means that 0.854 moles of sodium Na⁺ ions are dissolved in 500 mL of solution

In the second solution we have:

0.415 moles of Na₂SO₄ which means that 0.843 moles of sodium Na⁺ ions are dissolved in 500 mL of solution

Now we may conclude that the NaCl is more concentrated than the Na₂SO₄ solution.