Chemistry; Determination Of Purity

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BAMURANGE M.GRATIA G 11 IB GHA CHEMISTRY I.A (Expt i) DETERMINATION OF PURITY. How to determine the percentage of ethanoic acid (CH3COOH) in an impure sample of vinegar. Background information; In chemistry, for a particular experiment, a certain concentration of chemicals is required for certain results to occur or for just security purposes since some are very dangerous to the environment and even the people in general. Vinegar is known to be used to kill germs while preparing salad, which means it should not be used at its high concentration but at a low concentration. If used at high concentration, it can kill the components of food and since the food is to be eaten, it might cause problems in ones digestive parts. Due to such hazardous possibilities, chemists have been able to obtain the concentration they are in need of. In this experiment, I dealt with calculating the exact mass of ethanoic acid in a sample of vinegar. Research Question; How can I be able to find the mass of ethanoic acid contained in a sample of vinegar provided its molarity? Hypothesis; Using the method of titration, I can neutralize an alkaline by the vinegar; dilute ethanoic acid, and the volume of acid that neutralized the base contains the exact mass of the pure ethanoic acid in the impure vinegar. Apparatus; -a burette -a conical flask - two beakers - retort stand - Vinegar (9 grams per dm3) -sodium hydroxide solution -pipette -phenolphthalein -dropper Procedures; a) I filled the burette with vinegar up to zero mark. b) Using a pipette, I measured 25cm3of sodium hydroxide and transferred this into a conical flask. c) I added two drops of phenolphthalein in the conical flask. The color of the base is now orange. d) I put the conical flask under the burette, and opened the tap

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