One brand of laundry bleach is an aqueous solution containing 4.00% sodium hypochlorite (naocl) by mass. you may want to reference (pages 586 - 592) section 13.5 while completing this problem. part a what is the molarity of this solution? (assume a density of 1.02 g/ml.)

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Chemistry

Aurora

22 October, 11:03

One brand of laundry bleach is an aqueous solution containing 4.00% sodium hypochlorite (naocl) by mass. you may want to reference (pages 586 - 592) section 13.5 while completing this problem. part a what is the molarity of this solution? (assume a density of 1.02 g/ml.)

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Ariel Pratt · Answer 1

Answer is: molarity of this solution is 0,55 mol/l.

If we use 100 ml of solution:

V (solution) = 100 ml : 1000 ml/l = 0,1 l.

ω (NaClO) = 4,00% = 0,04.

d (solution) = 1,02 g/ml.

m (solution) = V (solution) · d (solution).

m (solution) = 100 ml · 1,02 g/ml.

m (solution) = 102 g.

m (NaClO) = ω (NaClO) · m (solution).

m (NaClO) = 0,04 · 102 g = 4,08 g.

n (NaClO) = m (NaClO) : M (NaClO).

n (NaClO) = 4,08 g : 74,44 g/mol = 0,055 mol.

c (NaClO) = 0,055 mol : 0,1 l = 0,55 mol/l.