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Asked Oct 30, 2019
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What would be the molar concentration of a 9.10% solution of sodium hypochlorite? (Assume the density of solution to be 1.0 g/mL.)

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Expert Answer

Step 1

Assuming 9.10 % by mass of sodium hypochlorite solution.

It means that 9.10 grams of sodium hypochlorite is present in 100 grams of solution. The density of solution is given as 1 g/mL. Hence the volume of solution is calculated as,

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Mass Density Volume 100 g 1 g/ml Volume Volume 100 mL 0.1 L

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Step 2

Hence the volume of solution is 0.1 L. The molar concentration can be calculated by calculating the number of moles of sodium hypochlorite (NaClO),

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Given mass No. of moles Molecular Mass Molecular Mass of NaClO 23 35.5 + 16 = 74.5 g/mol 9.10 g No. of moles 74.5 g/mol No. of moles =0.122 mol

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Step 3

The molar concentration (molarit...

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No.of moles of solute Molarity Volume of solution (L) 0.122 mol Molarity 0.1 L Molarity 1.22 mol/L = 1.22 M

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