Practice problems
| # | Question |
|---|---|
| 1 | What is the density of 49 ml of a liquid that weighs 272 g ? |
| 2 | What is the weight in grams of 246 ml liquid, with a specific gravity of 3.62? |
| 3 | If a drug has specific gravity of 3.40. How many ml of drug do you need to get 25 g of drug? |
| 4 | What is the specific gravity of a 160 ml of liquid that weighs 124 g? |
| 5 | How many mg of a drug will be there in 5 ml of 0.45 % w/v timolol ophthalmic solution? |
| 6 | What is the volume of isopropyl alcohol required to make 720 ml of rubbing alcohol (70% v/v isopropyl alcohol) |
| 7 | How many grams of dextrose are required to prepare 1690 ml of 37 % solution? |
| 8 | Calculate the % w/v of 6 w/w % NaCl solution having a specific gravity of 1.036. |
| 9 | Calculate the % w/w of a solution prepared by dissolving 35 g of a drug in 3500 ml of water? |
| 10 | A pharmacist dispenses 30 ml of 6 % 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 : 493 as a percent strength. |
| 12 | Express 0.50 % as a ratio strength. |
| 13 | Calculate the milligrams of drug required to prepare 30 ml of a 1: 205 antiseptic solution. |
| 14 |
How many milligrams of hexachlorophene should be used in compounding the following prescription? |
| 15 | Express 66 g in 300 ml as mg/ml. |
| 16 | Express 7 % w/v as mg/ml. |
| 17 | Express 1: 1800 (w/v) as mg/ml. |
| 18 | Calculate the concentration of copper in ppm if 41 ml of tap water contains 9 X 10 -5 parts of copper. |
Answers
The Answer to question 1 is: 5.55 g/ml
The Answer to question 2 is: 890.52 g
The Answer to question 3 is: 7.35 ml
The Answer to question 4 is: 0.78
The Answer to question 5 is: 22.50 mg
The Answer to question 6 is: 504.00 ml
The Answer to question 7 is: 625.30 g
The Answer to question 8 is: 6.22 % w/v
The Answer to question 9 is: 0.99 % w/w
The Answer to question 10 is: 300 mg
The Answer to question 11 is: 0.20 %
The Answer to question 12 is: 1 : 200
The Answer to question 13 is: 146.34 mg
The Answer to question 14 is: 65.00 mg
The Answer to question 15 is: 220.00 mg/ml
The Answer to question 16 is: 70.00 mg/ml
The Answer to question 17 is: 0.56 mg/ml
The Answer to question 18 is: 2.20 ppm