Conducting a Chemical Experiment with Precision: Following the Steps of a Peroxide Reaction Titration

A 10 cm3 sample of peroxide solution was pipetted into an Erlenmeyer flask, to this 5 cm3 of dilute sulfuric acid was added, and it was then titrated with permanganate. The titration was checked and the needed permanganate was recorded as the "original" permanganate value. The measuring cylinder was filled to the 100 cm3 mark with the peroxide solution and then 10 cm3 of 1% Kl solution was added. The time was recorded and the contents were immediately transferred to the other Erlenmeyer flask. The solution was kept stirred by shaking the flask. If a thermostat was used, the permanganate solution and colloidal platinum were at the temperature of the bath when they were mixed, and the Erlenmeyer reaction flask was kept in the bath. The progress of the reaction was followed by titrating 10 cm3 samples at approximately 10 minutes intervals. When about 9 minutes elapsed, a 10 cm3 sample of the reaction mixture was transferred by means of the 10 cm3 measuring cylinder into the Erlenmeyer, 5 cm3 of dilute sulfuric acid was added, and it was titrated rapidly with permanganate. The exact time at which the first drop of the permanganate was added was recorded. In as much as the peroxide continued to decompose until all of it had reacted with permanganate, the titration was continued as rapidly as possible. The volume of permanganate required was recorded. The process of titrating 10 cm3 samples of the reaction mixture at approximately 10 minutes interval was repeated until 8 samples had been analyzed.