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Synthesis of Iron (II) Sulphate FeSO4

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Introduction

Anglo-Chinese School (Independent) Year 3IP Chemistry Coursework Tong Viet Anh (29) 3.18 Nathan 2008 YEAR 3 IP CHEMISTRY PROJECT Synthesis of Iron (II) Sulphate FeSO4 Friday, 18th July 2008 Tong Viet Anh 3.18 Nathan A. Aim To produce a pure and dry sample of Iron (II) Sulphate FeSO4 crystal B. Apparatus & Materials Apparatus: Chemical: 100ml Beaker (1) Distilled water Glass rod (1) Sulphuric acid 1 mol/dm3 (H2SO4) Spatula (1) Iron filings (Fe) Filter paper (3) Filter funnel (1) Evaporating dish (1) Bunsen burner (1) Tripods stand (1) Wire gauze (1) Lighter (1) Cloth (1) IR light (1) Plastic bag (1) Goggles C. Method (Reactions of acid and metals) 1. Wash up the beaker, evaporating dish, funnel and glass rod so as to remove as much unwanted particles as possible and get the purest crystals. 2. Measure 40 cm3 of dilute Sulphuric acid (H2SO4) and pour it into the beaker. 3. Warm the acid to speed up reaction. 4. Add Iron fillings (Fe) one spatula at a time, stirring until no more or little Iron fillings dissolves. ...read more.

Middle

Sulphate (FeSO4) - Therefore, the expected amount of Iron (II) Sulphate (FeSO4) formed when using 0.040 mol of Sulphuric acid (H2SO4) is 0.040 mol which means the expected amount if crystal is also 0.040 mol - The weight of the expected amount of Iron (II) Sulphate crystal (FeSO4) is: 0.040mol x (56 + 32 + 16x4)g/mol = 6.08g - Percentage yield is: E. Evaluation and Conclusion Evaluation of the experiment: - The synthesis was done with care taken when cleaning all the apparatus and carrying out all the transferring. This is to minimize the impure particles in the solution before let it evaporate and get the highest purity of the crystals. - Using the evaporating dish ensures that the crystals will be formed in a short amount of time compared to the plastic bottle. - The yield is calculated to be less than 100% due to various reasons. First, it is the loss of a certain amount of solution in every transferring (i.e. from the beaker to the funnel, from the funnel to the dish). Second, some crystals are overheated until anhydrate, resulting in turning into powder, which was not to be weighted. ...read more.

Conclusion

of this modification: * It shortens time taken to evaporate the solution since the solution after cooled down is put under IR light, with the heat from the light the evaporation occurs faster. * Avoid over heat when heating the solution. * Another way to store the solution when waiting for it to evaporate the water Instead of using evaporating dish, we can also use a plastic bottle to store the solution Advantage: using the plastic bottle gives out large size and well-formed crystal; while the evaporating dish, due to its large surface area, the solution spreads over on a large area and therefore the crystals obtained at last is most likely in a form of tiny rods. Limitation: this will obviously takes a longer time to get the desired product. F. Acknowledgements First and foremost, to my subject teacher, Ms. Angeline Chua, for her detailed and carefully prepared instruction. I cannot fully express my gratitude to the lab assistances for their generous assistance whenever I had any problems with my project For his tireless support in doing the project, I would like to acknowledge Le Viet Anh of class 4.17 Solomon. G. ...read more.

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