Expressing Concentrations as Ratios and Percentages

A bag of dextrose 5% in water (D5W) is expressed as the following equation: w/v = 5 grams of dextrose

100 mL of water

• 10%

• 20%

• 5%

• 15%

How many grams of sodium chloride are in 100 mL of a 0.45% sodium chloride solution?

• 0.45 g

• 0.9 g

• 0.65 g

• 0.55 g

How many mL of active medication are in 100 mL of a 12% solution?

• 12 mL

• 1.2 mL

• 0.12 mL

• 100 mL

How many grams of active medication are in 100 g of a 23% cream?

• 100 g

• 77 g

• 23 g

• 27 g

A provider has prescribed an acetic acid (Vosol) solution of 0.25%. Which of the following ratios is equivalent to the prescribed amount?

• 1:400

• 1:4,000

• 1:40

• 1:4

A provider has prescribed a potassium permanganate (Permasol) solution of 1:500. Which of the following is the strength of the medication expressed as a percent?

• 0.002%

• 0.2%

• 0.02%

• 2%

A provider has prescribed epinephrine (Adrenalin) 1:10,000. Which of the following is the strength of the medication expressed as a percent?

• 0.1%

• 1%

• 0.01%

• 10%

Which of the following is the percent strength of a bag of sodium chloride that has a ratio of 9:1,000?

• 0.9%

• 9%

• 0.09%

• 0.009%

Which of the following is equivalent to the ratio of 1:20 expressed as a percent?

• 20%

• 5%

• 2%

• 50%

A provider has prescribed a magnesium sulfate (MgSO4) 1:100 solution. Which of the following is the percent strength of the solution?

• 0.01%

• 0.1%

• 0.001%

• 1%