NAPLEX Flashcards: Drug Concentrations And Ratio Strengths

What this deck covers

This deck focuses on Drug Concentrations And Ratio Strengths, giving you a quick way to review the definitions, rules, and examples that matter most for NAPLEX.

How to use these flashcards

Work through these flashcards in short sessions. Try to answer each prompt before flipping the card, then revisit any cards you miss until the explanation feels automatic.

Flashcard 1: Convert $0.25\%\ (w/v)$ to $\text{mg/mL}$.

Answer: $2.5\ \text{mg/mL}$. 0.25% w/v corresponds to 0.25 grams per 100 mL, or 2.5 mg per mL.

Flashcard 2: What percent strength is equivalent to ratio strength $1:40$?

Answer: $2.5\%$. Dividing 100 by 40 converts the ratio to 2.5% strength.

Flashcard 3: Convert $1:1000$ (w/v) to $\text{mg/mL}$.

Answer: $1\ \text{mg/mL}$. The ratio indicates 1 gram per 1000 mL, or 1 mg per mL.

Flashcard 4: What does ratio strength $1:1000$ mean in terms of solute per total volume for a solution?

Answer: $1\ \text{g in}\ 1000\ \text{mL}$ (w/v). Ratio strength expresses the proportion of solute to total volume in weight/volume terms.

Flashcard 5: Convert $1:5000$ (w/v) to $\text{mg/mL}$.

Answer: $0.2\ \text{mg/mL}$. The ratio means 1 gram in 5000 mL, converting to 0.2 mg per mL.

Flashcard 6: Convert $0.01\%\ (w/v)$ to ppm.

Answer: $100\ \text{ppm}$. 0.01% w/v equals 100 mg per liter, corresponding to 100 ppm.

Flashcard 7: How many $\text{mg/mL}$ is a $0.1\%\ (w/v)$ solution?

Answer: $1\ \text{mg/mL}$. 0.1% w/v is 0.1 grams per 100 mL, equivalent to 1 mg per mL.

Flashcard 8: Convert $2\%\ (w/v)$ to $\text{mg/mL}$.

Answer: $20\ \text{mg/mL}$. 2% w/v means 2 grams per 100 mL, converting to 20 mg per mL.

Flashcard 9: What is the general meaning of $\%\ (w/v)$ on a product label?

Answer: $\text{g solute per }100\ \text{mL solution}$. Weight/volume percentage indicates grams of solute dissolved in 100 mL of solution.

Flashcard 10: What is the general meaning of $\%\ (w/w)$ on a product label?

Answer: $\text{g solute per }100\ \text{g product}$. Weight/weight percentage represents grams of solute per 100 grams of total product.

Flashcard 11: Convert $50\ \text{ppm}$ to percent strength (w/v).

Answer: $0.005\%$. 50 ppm is 50 mg per liter, converting to 0.005% w/v.

Flashcard 12: What is the general meaning of $\%\ (v/v)$ on a product label?

Answer: $\text{mL solute per }100\ \text{mL solution}$. Volume/volume percentage denotes milliliters of solute in 100 mL of total solution.

Flashcard 13: What does ratio strength $1:10$ mean in terms of liquid in liquid (v/v)?

Answer: $1\ \text{mL in}\ 10\ \text{mL}$ (v/v). Volume/volume ratio strength denotes the volume of solute per total volume of solution.

Flashcard 14: Convert $0.02\%\ (w/v)$ to ratio strength $1:X$.

Answer: $1:5000$. Dividing 100 by 0.02 gives 5000 as the ratio denominator.

Flashcard 15: What ratio strength $1:X$ is equivalent to $0.5\%$ strength?

Answer: $1:200$. Dividing 100 by 0.5 equals 200, forming the ratio for 0.5% strength.

Flashcard 16: What does ratio strength $1:100$ mean in terms of solute per total weight for an ointment?

Answer: $1\ \text{g in}\ 100\ \text{g}$ (w/w). Ratio strength for weight/weight indicates solute mass per total mass of the mixture.

Flashcard 17: State the formula to convert percent strength to ratio strength $1:X$.

Answer: $X = \frac{100}{\%}$. The ratio denominator is calculated by dividing 100 by the percent strength value.

Flashcard 18: What ratio strength $1:X$ is equivalent to $2\%$ strength?

Answer: $1:50$. Dividing 100 by 2 gives 50 as the ratio denominator for 2% strength.

Flashcard 19: State the formula to convert ratio strength $1:X$ to percent strength.

Answer: $\% = \frac{100}{X}$. Percent strength is derived by dividing 100 by the ratio denominator to express concentration as a percentage.

Flashcard 20: What is the definition of parts per billion (ppb) in aqueous solutions?

Answer: $1\ \text{ppb} = 1\ \text{\textmu g/L}$. Parts per billion in aqueous solutions means micrograms per liter.

Flashcard 21: Convert $1:200$ (w/v) to percent strength.

Answer: $0.5\%$. Dividing 100 by 200 yields 0.5% for the equivalent concentration.

Flashcard 22: How many $\text{mg/mL}$ is a $1\%\ (w/v)$ solution?

Answer: $10\ \text{mg/mL}$. 1% w/v equals 1 gram per 100 mL, which converts to 10 mg per mL.

Flashcard 23: What percent strength is equivalent to ratio strength $1:1000$?

Answer: $0.1\%$. Dividing 100 by 1000 yields 0.1% as the equivalent concentration.

Flashcard 24: What is the definition of parts per million (ppm) in aqueous solutions?

Answer: $1\ \text{ppm} = 1\ \text{mg/L}$. Parts per million in aqueous solutions expresses concentration as milligrams per liter.