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You need to prepare Ms. Emmanuel's Magic Mouthwash using the formula below. If her prescription calls for 2 fl oz of Magic Mouthwash, how much of each ingredient will you use to make the prescribed amount?

**Magic Mouthwash**

- Diphenhydramine elixir 12.5 mg/5 mL: 80 mL
- Lidocaine viscous 2%: 80 mL
- Nystatin suspension: 80 mL

**Yields:** 240 mL

Answer :

Final answer:

To prepare 2 fl oz of Magic Mouthwash, approximately 19.7 mL of each ingredient (Diphenhydramine elixir, Lidocaine viscous, and Nystatin suspension) is needed, keeping the proportions consistent with the original formula.

Explanation:

To prepare Ms. Emmanuel's Magic Mouthwash in the prescribed amount of 2 fluid ounces (fl oz), we need to determine the quantity of each ingredient required proportional to the original formula.

The original formula yields 240 milliliters (mL), and since 1 fl oz is approximately 29.5735 mL, 2 fl oz is equivalent to about 59.147 mL (2 x 29.5735 mL).

The original formula consists of equal volumes of the three ingredients totaling 240 mL. Therefore, each ingredient (Diphenhydramine elixir, Lidocaine viscous, and Nystatin suspension) accounts for one-third of the total volume, which is 80 mL each.

To keep the proportions consistent for the 2 fl oz (59.147 mL) batch, we will calculate by dividing 59.147 mL by the sum of parts in the formula which is 3 (59.147 mL / 3 = 19.7157 mL).

This means we would need approximately 19.7 mL of each ingredient to make the 2 fl oz of Magic Mouthwash.

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