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formula for copper sulphate
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| Submitted: Fri Nov 10 2006
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Determination of the formula of Hydrated Copper Sulphate Crystals. Skills A and E Experiment 1 Mass of crucible: 28.54g Hydrated Copper: 2.40g Total: 30.94g After heating, Hydrated Copper = 1.60g Reheat after 5 minutes, mass: 1.59g Reheat after 5 minutes, mass: 1.58g Reheat after 5 minutes, mass: 1.57g final mass of hydrated copper Aim: Calculate the percentage by mass of water of crystallisation present in the crystals. 2.40 - 1.57 = 0.83 / 2.40 x 100 = 34.6%. Experiment 2 Aim: Use equations 1 and 2 to deduce the relationship between the number of moles of Cu2+ and the number of moles of S2O32- . Results Table Burette Readings Trial (cm3 ) Initial (cm3 ) Final (cm3 ) Volume used cm3 (final - initial) 23.75 0.00 23.90 23.90 0.00 23.85 23.85 0.00 23.80 23.80 0.00 23.90 23.90 Average titre Volume (cm3) : 23.86 It is a 2:2 ratio; the number of moles of Cu2+ is proportional to the number of moles of S2O32- . Sodium Thiosulphate: Number of moles = concentration x volume / 1000 0.1 x 23.86...
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