What is the percentage of alcohol in the following...

What is the percentage of alcohol in the following prescription?
Chloroform spirit $\quad 110.0 \mathrm{~mL}(88 \%$ alcohol)
Aromatic elixir $\quad 85.0 \mathrm{~mL}(22 \%$ alcohol $)$
Terpin hydrate elixir $255.0 \mathrm{~mL}$ ( $40 \%$ alcohol)
Sig. $5 \mathrm{~mL}$ for cough.

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Key Concepts

Percentage Concentration

This concept refers to the amount of a substance (in this case, alcohol) present in a solution expressed as a percentage of the total solution volume. It is a crucial concept in chemistry and pharmacy, as it helps determine the potency or strength of the solution and is used to ensure accurate dosing in mixtures.

Weighted Average

Weighted average is a method used to combine different components that each have a specific value (such as alcohol percentage) and volume into a single composite value. In the context of mixtures, it involves multiplying each component's percentage by its volume, summing these products, and then dividing by the total volume of the mixture to find the overall concentration.

Mixture Calculations

Mixture calculations involve determining the overall properties of a combined solution from various ingredients with differing properties. In prescription formulations and many industrial applications, these calculations ensure that the final mixture has the desired characteristics by properly accounting for the contributions of each component.

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