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 50.00 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

1. Calculate the number of moles of S2O3^-2 on required for the titration

2. Calculate the number of moles of I2 produced in the titration mixture.

3.Calculate the number of OCI- ion present inthe diluted bleaching solution titrated.

4. Calculate the mass of NaOCI present inthe diluted bleaching titrated

5. Calculate the mass of commercial bleaching solution titrated

6. Determine the percent NaOCI in the comercial bleaching solution

7. Calculate the mass of one gallon of the commercial bleaching solution.

8. Calculate the cost of 100g of the commercial bleaching solution.

9. Determine the cost of the amount of bleaching solution required to supply 100g of NaOCI

Explanation / Answer

1. Moles of S2O32-=(35.46×0.1052)÷1000=3.73×10^-3

2. Moles of I2=moles of s2O32-=3.73×10^-3

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