### 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 780 mL of a solution contains 0.78 g of drug, then express the concentration as a ratio.

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lb equals 1 : 1000 kg

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.
 (0.78 \quad g)/(780 \quad mL)=(1 \quad g)/(x) therefore x = 1000.
therefore (1 \quad g)/(1000 \quad mL) or 1 : 1000 will be the expression. Answer.