Analysing aspirin tablets by HCL acid.

Data Collection Trial 1st endeavor±0.01 second attempt± 0.1 3rd attempt ±0.1cm Initial         0cm         0cm         10.7cm         21.1cm Final         10.15cm         11.7cm         21.1cm         31.35cm symbolise/Titre         10.625cm burette - Hydrochloric Acid (0.10 mol dm?) Burette error - ± 0.1ml Pipette root word - Aspirin ascendant Pipette error - ± 0.06ml Indicator - Phenolphthalein (colour change in the acetylsalicylic acid rootage from colourless to pale pink) Data Processing and origination NaOH = 1.0M before hydrolysis of acetylsalicylic acid HCl = 0.1M 25cm of aspirin response = 1.0M of NaOH          NaOH at beat = (1.0/ hundred0) x 25 = 0.025 mol dm 1 aspirin = 2NaOH Aspirin tablets Molar mass = 180.17g M = g/Mr G = M x Mr (0.1/1000) x 10.625 (titre) = 0.001625 x 10 = 0.01625M mo les in start (0.025) - moles NaOH (0.01625) = 0.00875 / 2 = 0.00438 mol dm of NaOH in Moles of NaOH 0.00438 x 180.17 = 0.789g of Aspirin 1.5g of tablets contains 0.789g of aspirin so, (0.789/1.5) x 100 = 52.6% of aspirin in 1.5g of tablets.

Conclusion and Evaluation From the results above the experiment seem to work out as sooner accurate but due to a source of error caused by pouring too often dilute water into the aspirin solution, above the original 250cm mark, thereof having to pour some out caused a loss of NaOH as well, thereby making the results inaccurate and unreliable to an extent. The reason therefore the ploughshar e of aspirin present in the 25cm is around 5! 0% and not around 70/80% as it should be is due to the fact that more then 250cm of solution was lick where some of it was poured out making the a certain region of the aspirin slip out as well. The procedure was sooner well but due to the sources of error such as the glassware... If you want to get a full essay, order it on our website: BestEssayCheap.com

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