Question

The student diluted 50.00 mL of commercial bleaching solution to 250 mL in a volumetric flask, and titrated a 20-mL aliquot of the diluted bleaching solution. The titration required 35.46 mL of 0.1052M Na2S2O3 solution. A faded price label on the gallon bottle read $0.79. The density of the bleaching solution was 1.10 g/mL
Determine the volume of commercial bleaching solution present in the diluted bleaching solution titrated

Answer 1

To get the volume of the original solution in the dilution, we consider the dilutions that were made:

from 50 mL to 250 mL:

1/5 of original was present

from 20 mL of 250 mL:

1/12.5 of the diluted mixture was presetn

So, V=50 mL*(1/5)*(1/12.5)= 0.8 mL of original bleaching solution was present in dilution