Determination of the concentration of sulphuric acid by titration

Determination of the concentration of sulphuric tart by titration put down To determine the concentration of a solution of sulphuric tart by titration with sodium hydroxide Apparatus 250mL E-flask, stirrer with magnet, burette +0.1 ml, 10.0ml pipette Chemical H2SO4(aq), 0.100M NaOH(aq), BTB (pH-indicator) Experimental The burette is rinsed by and alter up by NaOH-solution. It is required that no transfer bubbles endow in the burette. 10.0ml of the H2SO4 is filled into the E-flask and diluted by distilled water supply to about 100 cm3. wherefore 10 spews of BTB and a magnetized stirring bar are added to it. After dropping 5 drops of BTB, the H2SO4 starts to change people of colour to pale yellow. Furthur dropping 5 more than drops, it becomes yellow. The E-flask is placed on the magnetic stirrer. The liquid is stirred. H2SO4 is titrated with NaOH. The H2SO4 is observed to establish a drop of ghastly colour liquid when adding a drop of NaOH. Howev er, it gradually disappear. The titration is considered to be end until the colour turns to green. and then the above procedure is repeated twice. The collected data is shown in table 1 Table 1. Raw data from titration of sulphuric acid with sodium hydroxide to determine the concentration of sulphuric acid mental testing1 st (+0.1ml)2nd (+0.1ml)3rd (+0.1ml) Vol. Of NaOH used when a blue drop starts to appear but gradually disappear12.2 ml11.7 ml12 ml Vol.

Of NaOH used when the colour is green20.0ml19.3 ml19.4 ml Calculations The equation of titration: 2NaOH + H2SO4  2H2O + Na2SO4 Average of volume of NaOH used for t! itration: (20.0+19.3+19.4)/3=19.57ml  come up of NaOH = niggardliness of NaOH Volume of NaOH fare of NaOH =0.1 0.1957 sum of NaOH =1.957 x 10-3 mol  mill ratio of NaOH and Na2SO4 : 2:1 NaOH =0.5 Na2SO4 Amount of Na2SO4: 1.957 x 10-3 /2 =9.785x 10-4 mol Amount of Na2SO4 = Concentration of Na2SO4 Volume of Na2SO4 9.785x 10-4 =...If you want to get a broad(a) essay, order it on our website: OrderCustomPaper.com

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