Analysis of Hydrated copper sulphate Essay Example for Free

Analysis of Hydrated copper sulphate EssayAim To dress the molecular formula of hydrated copper sulfate.Requirements Hydrous copper sulfateElectronic balanceEvaporating dishGlass rodTripod standBunsen burnermelting potProcedure First I weighed 3g of hydrated 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 weewee crystals. Faint green tinge became evident and fine white pulverise was formed from crystals. Continued heating led to formation of oliver green colour.Quantitative data Original weight of hydrous copper sulfate 3gError in electronic balance 0.001g (provided by the instructor)Data collection Trial 11.96gTrial 21.87gTrial 31.94gData Processing To minimize the errors I conducted three trials and averaged the readings to fin d a more accurate answer.= 1.93 g 0.001Change in mass = (3 0.001) (1.93 0.001)= 1.07 0.002The 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 0.002molesThe molar mass of anhydrous copper sulfate is 159.6g.No of moles of = = 0.012 0.001molesIn the equation I took the no of moles of water as x because it is unknown.CuSO4.xH20 CuSO4 + xH2OAccording to the equation the mole ratio between copper sulfate and water is 1 x. Therefore 1x = 0.012 0.001 0.059 0.002x = = 4.9 0.588 end point Hence the x value can be rounded off to 5 to get an integer answer. This means that in 1 molecule of hydrous copper sulfate there are 5 atoms of water present as crystals. The result is also equal to the literature value which was provided by the teacher and there seems to be no deviation because the answers are taken as inte ger and decimal points are excluded. The only systematic error present was in electronic balance. Moreover random error could have been caused during heating of the salt i.e. overheating or underheating. This error depends on the sight of colour change, therefore this is a very hard random error to eliminate.Evaluation As the answer is taken as integer, there seems to be zero error however silence a lot of errors are possible while conducting this experiment. During the heating of hydrous copper sulfate there maybe some water crystals still left hand 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 break upon these errors we must make sure that after the salt is heate d, its weight must be measured immediately so that there is very less era gap between it. Furthermore proper stirring and care taken during heating can also minimize errors.