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Analysis of Hydrated copper sulphate

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Introduction

Ayush Gupta Chemistry Standard Level May 2013 session Internal Assessment Lab report ANALYSIS OF HYDRATE COPPER SULPHATE. - Ayush Gupta. ________________ Aim ? To determine the molecular formula of hydrated copper sulfate. Requirements ? Hydrous copper sulfate Electronic balance Evaporating dish Glass rod Tripod stand Bunsen burner Crucible Procedure ? First I weighed 3g of hydrous copper sulfate on electronic balance and began heating it in an evaporating dish on top of a Bunsen burner. After the reaction was complete I measured the new weight to find a change in mass. Qualitative data ? After the reaction was complete, the colour changed from blue to white due to a loss of water crystals. Faint green tinge became evident and fine white powder was formed from crystals. ...read more.

Middle

= 1.07 ± 0.002 The change in mass was due to the loss of water crystals. Water (H20) has a molar mass of 18g. Therefore the change in mass must be equal to the mass of water present in copper sulfate. No of moles of water evaporated = = 0.059 ± 0.002moles The molar mass of anhydrous copper sulfate is 159.6g. No of moles of = = 0.012 ± 0.001moles In the equation I took the no of moles of water as x because it is unknown. CuSO4.xH20 → CuSO4 + xH2O According to the equation the mole ratio between copper sulfate and water is 1: x. Therefore 1:x = 0.012 ± 0.001: 0.059 ± 0.002 x = = 4.9 ± 0.588 Conclusion – Hence the x value can be rounded off to 5 to get an integer answer. ...read more.

Conclusion

Evaluation ? As the answer is taken as integer, there seems to be zero error however still a lot of errors are possible while conducting this experiment. During the heating of hydrous copper sulfate there maybe some water crystals still left due to inappropriate stirring and overheated or underheated salts could have also caused error. Main error which is inevitable is the hydration of crystals after being heated. The reaction is reversible and the after heating there could have been water vapour in the air which could have combined with the salt. Hence these can also lead to deviations in results. To improve upon these errors we must make sure that after the salt is heated, its weight must be measured immediately so that there is very less time gap between it. Furthermore proper stirring and care taken during heating can also minimize errors. ...read more.

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