A student followed the procedure of this experiment to determine the percent NaO

Question

A student followed the procedure of this experiment to determine the percent NaOCl in a commercial bleaching solution that was found in the basement of an abandoned house. The student diluted 50.00mL of the commercial bleaching solution to 250mL in a volumetric flask, and titrated a 20-mL aliquot of the diluted bleaching solution. The titration required 35.46mL of 0.1052M Na2S2O3 solution. A faded price label on the gallon bottle read $0.79. The density of the bleaching solution was 1.10g ML-1.

Questions:

1. Calculate the mass of one gallon of the commercial bleaching solution?

2. Calculate the cost of 100g of the commercial bleaching solution?

Explanation / Answer

Answer – There are given, 50 mL of commercial bleaching solution,

Density of bleaching solution = 1.10 g/mL

[Na2SO3] = 0.1052 M , volume = 35.46 mL

1) Mass of one gallon of the commercial bleaching solution

We know,

1 gallon = 3785.4 mL

So volume of commercial bleaching solution = 3785.4 mL

We know density of commercial bleaching solution is 1.10 g/mL

So, mass of commercial bleaching solution = 1.10 g/mL * 3785.4 mL

                                                                       = 4164 g

2) We calculate that

1 gal has 4164 g of commercial bleaching solution

And we are given commercial bleaching solution of 1 gal bottle is $0.79

Means

4164 g = $0.79

So, 100 g = ?

= $ 0.019

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