Percentage, Ratio Strength and Other Expressions of Concentration (Part 2) - mg/mL, mg%, ppm & ppb Flashcards
At the end of the lesson, the students must have: 1. Executed computation skills in solving concentration of a solution in the way that is most appropriate for a problem or application; 2. Familiarized with the different units used to expressed the concentration of solutions; 3. Stated the relationship between the different methods of expressing concentrations of pharmaceutical preparations; 4. Converted one expressions of concentration to another.
Twelve mL of glycerol is made up to 80 mL. What is the strength of the final solution as an amount strength?
(include unit and observe spacing before the unit)
The correct answer is: 0.15 mL/mL
One permitab solution tablet containing 300 mg of potassium permanganate is dissolved in 3L of water. What is the final strength of the solution expressed as a percentage strength?
Note: for uniformity and to get it correctly, place a space before the % sign
The correct answer is: 0.01 %
Express 0.7 ppm micrograms per mL
The correct answer is: 0.7 mcg/mL
Express 15 ppm as percentage strength. space before the %
The correct answer is: 0.0015 %
Calculate the amount of active ingredient present in the amount of product of stated percentage strength. (Percentage strength 22% w/w, amount 50 g)
Answer should be in g
The correct answer is: 11 g
Calculate the amount of product (in grams) that contains the stated amount of active ingredient of stated strength (strength is 12.5% w/v, amount of ingredient 635 mg)
Answer should be g, and 2 decimal places
The correct answer is: 5.08 g
If the concentration of fluoride is 0.25 ppm, how many liters (L) would contain 2 mg of fluoride?
The correct answer is: 8 L
How many milligrams (mg) of methyl paraben are needed to prepare 8 fluidounces of a solution containing 0.12% (w/v) of methyl paraben? Two decimal places, 1 fluidounce = 29.57 mL
The correct answer is: 283.87 mg
Suppose 17 grams of sucrose is dissolved in 183 grams of water. What is the concentration of sucrose in ppm?
Place comma in your answer
The correct answer is: 170,000 ppm
The solubility of NaCl is 284 grams/100 grams of water. What is this concentration in ppm?
Place comma per thousand
The correct answer is: 284, 000 ppm
The solubility of NaCl is 284 grams/100 grams of water. What is this concentration in ppm?
Separate number using comma.
The correct answer is: 284,000 ppm
Change 50 ppm to ppb.
The correct answer is: 50 ppb
How many parts per million (ppm) is 1mg/L?
The correct answer is: 1 ppm
Hydromorphone hydrochloride suppositories contain 3 mg of active ingredient and weigh approximately 2 grams each. What is the equivalent percentage?
The correct answer is: 0.15 %
If a city water supply has a limit of 250 ppm of nitrate ion, what is the maximum amount of nitrate ion, in grams, that may be present in a 10,000-gallon reservoir? (one decimal point, include comma, unit)
The correct answer is: 9,462.5 g
