titration

... CHAN CHI HEI 6LS(1) Title Standardisation of sulphric acid Aim To determine the concentration of a sulphuric acid by titration against a standard solution of sodium carbonate just prepared Result Trial 1st 2nd 3rd Final Burette Readings/cm3 10.20 14.80 19.50 24.10 Initial Burette Readings/cm3 5.00 10.20 14.80 19.50 Volume used/ cm3 5.20 4.60 4.70 4.60 Mean volume used/ cm3 4.63 Calculation Na2CO3(aq)+H2SO4(aq)-->Na2SO4(aq)+H2O(l)+CO2(g) Since Na2CO3: H2SO4 = 1:1 No of mol in H2SO4 = 0.1 x (25/1000) = 2.5 x 10-3 mol Then the concentration of H2SO4 = (2.5 x 10-3 ) / (4.63/1000) = 0.5399M Discussion During the experiment ,there may be some possible error and some of them can be minimized. First, the water inside the burrete may affect the concentration of sulphuric acid. To prevent this , we need to rinse the burrete with sulphuric acid. Also , we need to make sure the top of burrete is filled of s sulphuric acid. Simiarly , the pipette should be rinsed with the sodium carbonate solution before. Also, our eye level should be horizontal to that of the water level so that

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