Practice problems
| # | Question |
|---|---|
| 1 | What is the density of 234 ml of a liquid that weighs 257 g ? |
| 2 | What is the weight in grams of 411 ml liquid, with a specific gravity of 3.82? |
| 3 | If a drug has specific gravity of 1.20. How many ml of drug do you need to get 60 g of drug? |
| 4 | What is the specific gravity of a 150 ml of liquid that weighs 431 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 120 ml of rubbing alcohol (70% v/v isopropyl alcohol) |
| 7 | How many grams of dextrose are required to prepare 4720 ml of 12 % solution? |
| 8 | Calculate the % w/v of 22 w/w % NaCl solution having a specific gravity of 1.16. |
| 9 | Calculate the % w/w of a solution prepared by dissolving 65 g of a drug in 4550 ml of water? |
| 10 | A pharmacist dispenses 55 ml of 18 % 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 : 670 as a percent strength. |
| 12 | Express 1.00 % as a ratio strength. |
| 13 | Calculate the milligrams of drug required to prepare 75 ml of a 1: 215 antiseptic solution. |
| 14 |
How many milligrams of hexachlorophene should be used in compounding the following prescription? |
| 15 | Express 89 g in 300 ml as mg/ml. |
| 16 | Express 45 % w/v as mg/ml. |
| 17 | Express 1: 300 (w/v) as mg/ml. |
| 18 | Calculate the concentration of copper in ppm if 57 ml of tap water contains 9 X 10 -5 parts of copper. |
Answers
The Answer to question 1 is: 1.10 g/ml
The Answer to question 2 is: 1570.02 g
The Answer to question 3 is: 50.00 ml
The Answer to question 4 is: 2.87
The Answer to question 5 is: 20.00 mg
The Answer to question 6 is: 84.00 ml
The Answer to question 7 is: 566.40 g
The Answer to question 8 is: 25.52 % w/v
The Answer to question 9 is: 1.41 % w/w
The Answer to question 10 is: 900 mg
The Answer to question 11 is: 0.15 %
The Answer to question 12 is: 1 : 100
The Answer to question 13 is: 348.84 mg
The Answer to question 14 is: 28.57 mg
The Answer to question 15 is: 296.67 mg/ml
The Answer to question 16 is: 450.00 mg/ml
The Answer to question 17 is: 3.33 mg/ml
The Answer to question 18 is: 1.58 ppm