Pipette 25cm3 of sulfuric acid into a conical flask., Add a few drops of screened methyl orange to the conical flask., Sodium hydroxide is run from a burette into the conical flask until the indicator turns green., The volume of alkali added is recorded., The experiment is repeated with another 25cm3 of sulfuric acid, but no indicator is added., The same volume of sodium hydroxide as recorded earlier is added to the flask., Evaporate the solution to the point of crystallisation., Cool the saturated solution to obtain sodium sulfate crystals., Filter the solution to obtain crystals., Wash the crystals with deionised water and dry them between sheets of filter paper..

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