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Question: write in past tense.Pipette a 10 cm3 sample of peroxide solution into an Erlenmeyer flask, add 5 cm3 of dilute sulfuric acid, and titrate with permanganate. Check the titration and record the permanganate required as the "original" permanganate value. Fill the measuring cylinder to the 100 cm3 mark with the peroxide solution and then add 10 cm3 of 1% Kl solution. Record the time and immediately transfer the contents to the other Erlenmeyer flask. Keep the solution stirred by shaking the flask. (If a thermostat is used, the permanganate solution and colloidal platinum should be at the temperature of the bath when they are mixed, and the Erlenmeyer reaction flask should be kept in the bath). The progress of the reaction is now followed by titrating 10 cm3 samples at approximately 10 minutes intervals. When about 9 minutes have elapsed, transfer a 10 cm3 sample of the reaction mixture by means of the 10 cm3 measuring cylinder into the 54 Erlenmeyer, add 5 cm3 of dilute sulfuric acid, and titrate rapidly with permanganate. Record the exact time at which the first drop of the permanganate is added. In as much as the peroxide continues to decompose until all of it has reacted with permanganate, the titration should be continued as rapidly as possible. Record the volume of permanganate required. Titrate successively 10 cm3 samples of the reaction mixture at approximately 10 minutes interval until 8 samples have been analyzed
A 10 cm3 sample of peroxide solution was pipetted into an Erlenmeyer flask, followed by the addition of 5 cm3 of dilute sulfuric acid. The solution was then titrated with permanganate. The titration was checked and the required permanganate was recorded as the "original" permanganate value. The measuring cylinder was filled to the 100 cm3 mark with the peroxide solution and 10 cm3 of 1% Kl solution was added. The time was recorded and the contents were immediately transferred to another Erlenmeyer flask. The solution was kept stirred by shaking the flask. The progress of the reaction was then followed by titrating 10 cm3 samples at approximately 10 minutes intervals. When about 9 minutes had elapsed, a 10 cm3 sample of the reaction mixture was transferred into the Erlenmeyer by means of the 10 cm3 measuring cylinder, 5 cm3 of dilute sulfuric acid was added, and the solution was rapidly titrated with permanganate. The exact time at which the first drop of permanganate was added was recorded. As the peroxide continued to decompose until it had entirely reacted with permanganate, the titration was carried out as rapidly as possible. The volume of permanganate required was then recorded. Successively, 10 cm3 samples of the reaction mixture were titrated at approximately 10 minutes intervals until 8 samples had been analyzed.
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