Determine weight of total content from PPM from the weight of the drug

3. Percent, Ratio, mg/mL, PPM, PPB 3.4) PPM and PPB 3.4.1) PPM, PPB - General

3.4.1.1) Drug weight from PPM and total Weight Easy 1


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The potency of a preparation is 36.3 PPM. How many kilograms will this preparation weigh, if it contains 1324.95 mg of a drug?


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lb equals 36.5 Kg kg

    PPM is the number of grams present per 1 million (1,000,000) grams of the preparation or solution or mixture.
    36.3 PPM means, there is 36.3 g of drug present in each million (1,000,000) g of the preparation.
    Weight of drug = 1324.95 mg.
    Converting it to grams `=1324.95/1000=1.32495` g.
    Therefore, we can write:
    `(36.3 \quad g)/(1,000,000\quad g)=(1.32495\quad g)/x therefore x = 36500` g.
    Converting g into Kg:
    `=36500/1000=36.5` Kg. Ans.