A chemical supply company sells a concentrated solution of aqueous h2so4 (molar mass 98 g mol-1) that is 50. percent h2so4 by mass. at 25°c, the density of the solution is 1.4 g ml-1. what is the molarity of the h2so4 solution at 25°c?

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Chemistry

26 July, 12:30

A chemical supply company sells a concentrated solution of aqueous h2so4 (molar mass 98 g mol-1) that is 50. percent h2so4 by mass. at 25°c, the density of the solution is 1.4 g ml-1. what is the molarity of the h2so4 solution at 25°c?

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Evelin Preston · Answer 1

Answer is: the molarity of the sulfuric acid is 7.14 M.

ω (H₂SO₄) = 50% : 100% = 0.5.

d (H ₂SO₄) = 1.4 g/mL.

V (H₂SO₄) = 100 mL : 1000 mL/L = 0.1 L ...

mr (H₂SO₄) = d (H₂SO₄) · V (H₂SO₄).

mr (H₂SO₄) = 1.4 g/mL · 100 mL.

mr (H₂SO₄) = 140 g.

m (H₂SO₄) = ω (H₂SO₄) · mr (H₂SO₄).

m (H₂SO₄) = 0.5 · 140 g.

m (H₂SO₄) = 70 g.

n (H₂SO₄) = m (H₂SO₄) : M (H₂SO₄).

n (H₂SO₄) = 70 g : 98 g/mol.

n (H₂SO₄) = 0.714 mol.

c (H₂SO₄) = n (H₂SO₄) : V (H₂SO₄).

c (H₂SO₄) = 0.714 mol : 0.1 L.

C (H₂SO₄) = 7.14 M.