Determine ratio strength and volume and drug quantity
3. Percent, Ratio, mg/mL, PPM, PPB 3.2) Ratio 3.2.1) Ratio - General
3.2.1.1) Ratio - General Normal 1
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If 500 mL of a solution contains 0.595 g of drug, then express the concentration as a ratio.
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lb equals 1 : 840 kg
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Ratio strength will have 1 in the numerator (in g unit). Let us, therefore, determine, what volume of this solution will contain 1 g of drug.
` (0.595 \quad g)/(500 \quad mL)=(1 \quad g)/(x) therefore x = 840`.
`therefore (1 \quad g)/(840 \quad mL)` or 1 : 840 will be the expression. Answer.