Practice problems
| # | Question |
|---|---|
| 1 | What is the density of 148 ml of a liquid that weighs 255 g ? |
| 2 | What is the weight in grams of 192 ml liquid, with a specific gravity of 2.84? |
| 3 | If a drug has specific gravity of 0.80. How many ml of drug do you need to get 20 g of drug? |
| 4 | What is the specific gravity of a 90 ml of liquid that weighs 8 g? |
| 5 | How many mg of a drug will be there in 20 ml of 0.10 % w/v timolol ophthalmic solution? |
| 6 | What is the volume of isopropyl alcohol required to make 180 ml of rubbing alcohol (70% v/v isopropyl alcohol) |
| 7 | How many grams of dextrose are required to prepare 4960 ml of 12 % solution? |
| 8 | Calculate the % w/v of 18 w/w % NaCl solution having a specific gravity of 1.13. |
| 9 | Calculate the % w/w of a solution prepared by dissolving 50 g of a drug in 4850 ml of water? |
| 10 | A pharmacist dispenses 40 ml of 14 % w/v ibuprofen suspension, which is to be taken as 2 teaspoonful’s per day. How many milligrams of ibuprofen are contained per teaspoonful? |
| 11 | Express 1 : 367 as a percent strength. |
| 12 | Express 0.10 % as a ratio strength. |
| 13 | Calculate the milligrams of drug required to prepare 45 ml of a 1: 55 antiseptic solution. |
| 14 |
How many milligrams of hexachlorophene should be used in compounding the following prescription? |
| 15 | Express 92 g in 850 ml as mg/ml. |
| 16 | Express 54 % w/v as mg/ml. |
| 17 | Express 1: 4200 (w/v) as mg/ml. |
| 18 | Calculate the concentration of copper in ppm if 41 ml of tap water contains 1 X 10 -5 parts of copper. |
Answers
The Answer to question 1 is: 1.72 g/ml
The Answer to question 2 is: 545.28 g
The Answer to question 3 is: 25.00 ml
The Answer to question 4 is: 0.09
The Answer to question 5 is: 20.00 mg
The Answer to question 6 is: 126.00 ml
The Answer to question 7 is: 595.20 g
The Answer to question 8 is: 20.34 % w/v
The Answer to question 9 is: 1.02 % w/w
The Answer to question 10 is: 700 mg
The Answer to question 11 is: 0.27 %
The Answer to question 12 is: 1 : 1000
The Answer to question 13 is: 818.18 mg
The Answer to question 14 is: 1.25 mg
The Answer to question 15 is: 108.24 mg/ml
The Answer to question 16 is: 540.00 mg/ml
The Answer to question 17 is: 0.24 mg/ml
The Answer to question 18 is: 0.24 ppm