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Determination of the concentration of lime water solution  

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Victioria Nicholls Chemistry Coursework Title: Determination of the concentration of lime water solution Objective: The aim of this experiment is to determine the concentration of an unknown limewater solution in g dm-3 as accurately as possible, which contains 1g dm-3 of calcium hydroxide. This will be done by titration with hydrochloric acid. The Reaction occurring is: Ca(OH)2(l) + 2HCl(l) › CaCl2(l) + H2O(l) Apparatus: Metal stand Burette Conical flask 25cm3 Pipette 250cm3 volumetric flask Lime-water solution Hydrochloric acid Methyl-red indicator Diagram Method: 1.Firstly, determination of the concentration of hydrochloric acid to be used is to be carried out, as the 2.00 mol dm-3 solution of hydrochloric acid supplied is too concentrated. This was done by diluting the 2.00 mol dm-3 solution with water to the values 1.00, 0.50, 0.10 and 0.02mol dm-3 of hydrochloric acid. The was done using preliminary results: Concentration of HCl (mol dm-3) Volume of HCl required to neutralise the lime water (cm3) 2.00 1.60 1.00 3.50 0.50 7.00 0.10 15.00 0.02 30.00 4. The 0.02 mol dm-3 concentration of hydrochloric acid proved to give the most...

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