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    qu1) 1.3564g sample was heated at 105 degrees to constant weight, which was found to be 1.3484g. Calculate % loss on drying. I worked this out to be 0.59%

    QU2) Calculate percentage purity of sample with respect to dried material?
    qu 3) Solution S was prepared by dissolving 5g of sample in 100ml h20. 10ml of solution s was diluted to 15ml with h20. This was then added to 1ml of 25% w/v barium chloride solution and the opalescence obtained was no greater than when 15ml 10ppm sulphate solution was added to 1ml 25%w/v barium chloride solution. Calculate max amount of sulphate present in sample.

    Can anyone please take me through qu 2 and 3.
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