Quantitative Preparation Of A Salt And Yield Calculation.

872 words - 3 pages

Introduction:Copper(II) sulphate can easily be prepared by reacting copper(II) oxide with dilute sulphuric acid. The resulting copper(II) sulphate solution when cooled can easily crystallize, so the amount of the product can be accurately measured. This lab result can then be compared to the theoretical amount to give a % of the yield calculated. The then Copper(II) sulphate crystals are CuSO4.5H2O.Hypothesis:It is my opinion that the results we will receive from the experiments will differ by quite a bit off, by my estimate about 15-25% off the theoretical results one would get by doing the equations of the products sought after. I believe this as the experiment will be taking place in a school laboratory which could cause the apparatuses to cause error or human error could also take place.Apparatus:- 1 measuring cylinder (200ml ±0.1ml)- 2 Beakers (250ml ±0.1ml) & larger one- Filter paper- Scale- Funnel- Bunsen burner- Heat prove mat- StandProcedure:1. Collect the Apparatus.2. Measure out 100 ml (±0.1ml) of 2M dilute sulphuric acid (this is the limiting agent) and poor into a 250ml beaker (±0.1ml).3. Warm the acid in the Bunsen burner (DO NOT BOIL).4. Add copper sulphate until it is in excess ( this can be added in excess as the Sulphuric Acid is the limiting agent which mean.5. While still warm and using a larger beaker, filter the solution and wash off the residue. Do this with the funnel on a stand so no residue leeks into the solution.6. Boil the remaining Copper sulphate solution until about 50% of the solution has evaporated.7. Leave to cool down and crystallize.8. Dry the crystals between fresh filter papers and when fully dry weigh the results.Result/Data collection:Amount of H2SO4:100cm" of H2SO4 ± 0.5 cm" ± 0.5%The amount of H2SO4 poured into the beaker might not be exact therefore I have put an uncertainties table.-Collection:Weight of copper sulphate formed is approximately 38.38g ± 0.001g.The color of the copper sulphate formed was blue therefore this implies that the copper sulphate is hydrous.-Equation:CuO + H2SO4 CuSO4.5H2O1 mol. 1 mol. 1 mol.79.5 g 98.1 g 249.5 g0.2 M 0.2M 0.2M15.9g 9.81g...

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