Determine volume from ratio strength and drug quantity

3. Percent, Ratio, mg/mL, PPM, PPB 3.2) Ratio 3.2.1) Ratio - General Ratio - General Normal 1

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Determine the volume of a solution which will contain 0.505 g of drug, if its strength is expressed as 1 : 990.

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lb equals 500 mL kg

    1 : 990 means, 1 g of drug is present in each 990 mL of the solution.

    To determine the volume of the solution which contains 0.505 gram of drug, we can write
    `(1 \quad g)/(990 \quad mL)=(0.505 \quad g)/x therefore x = 500 ` mL.