Problem: Calculate the molarity of hypochlorite ion in a commercial bleach solution. It contains 5.25% sodium hypochlorite by mass and the density of the solution is 1.08g/mL.

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We are asked to calculate the molarity of hypochlorite ion in a commercial bleach solution.

5.25% sodium hypochlorite by mass and the density of the solution is 1.08g/mL.

sodium hypochlorite → NaOCl

Assume 100 g solution → 5.25 g NaOCl


Calculate moles OCl :

Molar mass NaOCl = 74.44 g/mol

mol OCl- = 5.25 g NaOCl × 1 mol NaOCl74.44 g NaOCl×1 mol OCl-1 mol NaOCl

mol OCl = 0.071 mol OCl


Calculate volume: 

100 g ×1 mL1.08 g×10-3 L  1 mL

 = 0.093 L


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Problem Details

Calculate the molarity of hypochlorite ion in a commercial bleach solution. It contains 5.25% sodium hypochlorite by mass and the density of the solution is 1.08g/mL.

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