The formula for a mixture states that 50 000 μg ergocalciferol need to be dissolved in a small volume of chloroform and then made up to 5 ml with the chloroform. The formula further requires the addition of 0.75 ml acetic anhydrate and 1.20 ml of sulphuric acid to this ergocalciferol solution. If the sulphuric acid contains 10% w/v ergocalciferol, calculate the concentration of ergocalciferol in the total mixture in % w/v. (Answer to 4 decimal places).
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