Chem lab help.
This analysis should be performed on two different brands of bleach; preferably one name brand and one generic. Prepare one sample of each bleach solution by determining the mass of 10.00 mL of the bleach placed into a 100 mL volumetric flask. The masses will be used to determine the density of bleach. Dilute the sample to the 100 mL mark with deionized water and mix well. Rinse the pipet out with a little of the diluted bleach solution twice and pipet a 10.00 mL aliquot into a 250 mL Erlenmeyer flask. Add 1.0 g of potassium iodide and swirl the resulting mixture. Add 5.0 mL of 6 M HCI to the mixture. Titrate with the standardized sodium thiosulfate solution until the amber iodine color begins to fade to a pale yellow. At this point add 2 mL of 0.4% starch solution and resume titrating until the dark color of the starch-iodine complex just disappears. Be sure to use ½ drop quantities as you near the endpoint by swiftly turning the stopcock 180° or by splitting a drop. An abrupt color change from dark blue to colorless marks the endpoint. Repeat the analysis with a second brand of bleach.
Reults
Clorox
A-1
Mass of 10 mL
9.697 g
10.72 g
Density
.9697 g/mL
1.072 g/mL
Avg density
1.021 g/mL
1.021 g/mL
Vol of diluted bleach
10 mL
10 mL
Vol of Na2S2O3
12.7 mL
12mL
Moles of Na2S2O3
.0014 mol
.00124 mol
Calculate the molarity of the diluted aliquot of bleach, the concentrated bleach solution and mass% of the bleach solutions.
Calculate average, average deviation, and the percent error.
Chem lab help.
This analysis should be performed on two different brands of bleach; preferably one name brand and one generic. Prepare one sample of each bleach solution by determining the mass of 10.00 mL of the bleach placed into a 100 mL volumetric flask. The masses will be used to determine the density of bleach. Dilute the sample to the 100 mL mark with deionized water and mix well. Rinse the pipet out with a little of the diluted bleach solution twice and pipet a 10.00 mL aliquot into a 250 mL Erlenmeyer flask. Add 1.0 g of potassium iodide and swirl the resulting mixture. Add 5.0 mL of 6 M HCI to the mixture. Titrate with the standardized sodium thiosulfate solution until the amber iodine color begins to fade to a pale yellow. At this point add 2 mL of 0.4% starch solution and resume titrating until the dark color of the starch-iodine complex just disappears. Be sure to use ½ drop quantities as you near the endpoint by swiftly turning the stopcock 180° or by splitting a drop. An abrupt color change from dark blue to colorless marks the endpoint. Repeat the analysis with a second brand of bleach.
Reults
| Clorox | A-1 | |
| Mass of 10 mL | 9.697 g | 10.72 g |
| Density | .9697 g/mL | 1.072 g/mL |
| Avg density | 1.021 g/mL | 1.021 g/mL |
| Vol of diluted bleach | 10 mL | 10 mL |
| Vol of Na2S2O3 | 12.7 mL | 12mL |
| Moles of Na2S2O3 | .0014 mol | .00124 mol |
Calculate the molarity of the diluted aliquot of bleach, the concentrated bleach solution and mass% of the bleach solutions.
Calculate average, average deviation, and the percent error.
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