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    1) How much 80% (v/v) glycerol would need to be added to distilled water to produce 25ml of a final concentration of 100mM?

    2) What is the molarity of a 3% (w/v) solution of NaCl?

    3) You have been given 0.3M solution of NaCl. How much should be added to distilled water to produce 2.5ml of a final concentraion of 100mM?

    Please can anyone help me with any of these calculations?

    These arent hard. 3% means 3g in 100ml. Molarity is mol/L. Simply work out how many grams in 1L which is 30g. Now work out how many mol this is. Grams = mol x molecular weight. So grams divide by molecular weight = mol.
    Work out the molecular weight of NaCl to solve.

    You need the book called 'MCQs in pharmacy calculations.' The ebook is on ebay for a few quid.

    Are you just starting pharmacy or applying, as you need to learn this stuff. Its vital for the job.
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