In a food and drink industry, sulphur dioxide is often used as a preservative. By gravimetric analysis, the content of sulphur dioxide in dried peaches was calculated as follows: The dried peaches were powdered in a blender. A sample of the peach powder weighing 45.0692 g was put into a conical flask containing 100 mL of deionized water. A 3% solution of hydrogen peroxide was added to convert the dissolved sulphur dioxide to sulphate ions. The conversion of sulphur dioxide to sulphuric acid is shown in the half equation: SO2 (aq) + 2H2O (I) O SO,? (aq) + 4H* (aq) + 2e- An excess of calcium chloride solution was then added. The calcium sulphate precipitate was filtered off, dried and weighed to constant mass. The equation for the precipitation of calcium sulphate is Ca?*(aq) + SO, (aq) => CaSO4(s) The following results were recorded. i. ii. ii. iv. V. Mass of dry filter paper 0.951 g Mass of dry filter paper and CaSO4 sample 1.538 g Determine the percentage, by mass, of SO2 in the peach sample.

In a food and drink industry, sulphur dioxide is often used as a preservative. By gravimetric analysis, the content of sulphur dioxide in dried peaches was calculated as follows: The dried peaches were powdered in a blender. A sample of the peach powder weighing 45.0692 g was put into a conical flask containing 100 mL of deionized water. A 3% solution of hydrogen peroxide was added to convert the dissolved sulphur dioxide to sulphate ions. The conversion of sulphur dioxide to sulphuric acid is shown in the half equation: SO2 (aq) + 2H2O (I) O SO,? (aq) + 4H* (aq) + 2e- An excess of calcium chloride solution was then added. The calcium sulphate precipitate was filtered off, dried and weighed to constant mass. The equation for the precipitation of calcium sulphate is Ca?*(aq) + SO, (aq) => CaSO4(s) The following results were recorded. i. ii. ii. iv. V. Mass of dry filter paper 0.951 g Mass of dry filter paper and CaSO4 sample 1.538 g Determine the percentage, by mass, of SO2 in the peach sample.

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Stoichiometry

Stoichiometry is a chemical division that evaluates the quantitative content of the chemical process with the help of the reacting molecules or products taking part in the reaction. The term “stoicheion” in “Stoichiometry”, is an old Greek term for "element" whereas “metron” means "measure".

Question

b) In a food and drink industry, sulphur dioxide is often used as a preservative. By gravimetric
analysis, the content of sulphur dioxide in dried peaches was calculated as follows:
i.
The dried peaches were powdered in a blender.
A sample of the peach powder weighing 45.0692 g was put into a conical flask
containing 100 mL of deionized water.
ii.
iii.
A 3% solution of hydrogen peroxide was added to convert the dissolved sulphur
dioxide to sulphate ions. The conversion of sulphur dioxide to sulphuric acid is shown
in the half equation:
SO2 (aq) + 2H2O (I) O SO,? (aq) + 4H* (aq) + 2e-
An excess of calcium chloride solution was then added. The calcium sulphate
precipitate was filtered off, dried and weighed to constant mass. The equation for
the precipitation of calcium sulphate is
Ca?+(aq) + SO? (aq) => CaSO:(s)
The following results were recorded.
iv.
V.
Mass of dry filter paper
0.951 g
Mass of dry filter paper and CaSO4 sample
1.538 g
Determine the percentage, by mass, of SO2 in the peach sample.

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