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The purity of aminosulphonic acid

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The purity of aminosulphonic acid Titration number 1 2 3 4 Final burette reading/cm3 23.30 22.50 45.10 23.50 Initial burette reading/cm3 0.00 0.10 22.40 1.00 Amount of acid used for each titration: 1- 23.00-0.00=23.00 cm3 2- 22.50-0.10=22.40 cm3 3- 45.10-22.40=22.70 cm3 4- 23.50-1.00=22.50 cm3 The amount of acid used for the first titration is a little higher than it should be so to make the calculation much more accuracy I will ignore the first one and I will work out the average of the other three values: 22.40+22.70+22.50=67.6 cm3 67.6/3=22.53 cm3 (2 decimals place) 22.53 cm3 is average amount of acid (H2NSO3H) reacted with 25.00 cm3 of alkali (NaOH) ...read more.


Now I can say that the number of moles of acid in 22.53 cm3 of that (which is the average amount of the acid I worked that out before) is equal to 0.005. So I can work out the number of moles of acid in 250cm3 of that. Number of moles in cm3 X=250*0.005/22.53 0.005 22.53 X=0.0555 moles in 250 cm3 acid X 250 Now I can work out the number of grams of the acid (H2NSO3H) by using its molecular number (Mr=97): Number of moles of H2NSO3H is equal to this number of grams 1 97 0.0555 Y Y=0.0555*97=5.3835 grams Now I can work out the value of percentage purity which is : Percentage purity = 5.3835/5.6=0.9613=96.13% Also I can work out the value ...read more.


+ (0.25/250) + (0.05/25) + (0.10/22.53) = 0.0253=2.53% Reasons for the values of errors and differences in each step could be: * Rounding the answers. * Using unsuitable scales which could be improve by using smaller scale(for example using mg instead if g and also much more sensitive apparatus) * Using too much indicator (phenolphthalein) which makes it to take more time to be colourless. * Do not staring the substance during the experiment. * Do not dissolving the substances completely in the water. * The acid may have different concentration in different level of that for example higher parts may have lower concentration and lower parts may have higher consequently the samples taken from that may have a different concentration each time. Also this case may apply for alkali as well. * Subside of the substances. ...read more.

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