Inorganic Chemistry - Acids, Bases and Salt Preperations (Paper 2)
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how would you prepare a pure, dry sample of a soluble salt, starting from an acid and alkali?
• pipette 25cm3 of alkali into a conical flask • do not add an indicator to prevent contamination • using the titration values, titrate the known volume acid into a conical flask • transfer to an evaporating basin & heat the solution • allow the solution to cool so that hydrated crystals form • remove the crystals by filtration and wash with distilled water • dry by leaving it in a warm place
how would you prepare a pure, dry sample of an insoluble salt, starting from two soluble reactants?
• mix the two salt solutions in a beaker • stir with a glass rod • filter using filter paper and funnel • wash with distilled water • dry by leaving it in a warm place
how would you prepare a sample of pure, dry lead(II) sulfate?
• start with lead (II) nitrate solution and sodium sulfate solution • mix similar volumes of lead nitrate solution and sodium sulfate solution in a beaker, precise volumes do not matter • a white precipitate of lead (II) sulfate will form. • filter the creation mixture • wash the residue left on the filter paper with distilled water several times to remove impurities • dry in a warm oven