Practice problems
| # | Question |
|---|---|
| 1 | What is the density of 188 ml of a liquid that weighs 127 g ? |
| 2 | What is the weight in grams of 233 ml liquid, with a specific gravity of 1.74? |
| 3 | If a drug has specific gravity of 1.80. How many ml of drug do you need to get 35 g of drug? |
| 4 | What is the specific gravity of a 325 ml of liquid that weighs 417 g? |
| 5 | How many mg of a drug will be there in 5 ml of 0.25 % w/v timolol ophthalmic solution? |
| 6 | What is the volume of isopropyl alcohol required to make 50 ml of rubbing alcohol (70% v/v isopropyl alcohol) |
| 7 | How many grams of dextrose are required to prepare 480 ml of 58 % solution? |
| 8 | Calculate the % w/v of 24 w/w % NaCl solution having a specific gravity of 1.18. |
| 9 | Calculate the % w/w of a solution prepared by dissolving 35 g of a drug in 4850 ml of water? |
| 10 | A pharmacist dispenses 20 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 : 254 as a percent strength. |
| 12 | Express 0.20 % as a ratio strength. |
| 13 | Calculate the milligrams of drug required to prepare 35 ml of a 1: 155 antiseptic solution. |
| 14 |
How many milligrams of hexachlorophene should be used in compounding the following prescription? |
| 15 | Express 16 g in 800 ml as mg/ml. |
| 16 | Express 10 % w/v as mg/ml. |
| 17 | Express 1: 1500 (w/v) as mg/ml. |
| 18 | Calculate the concentration of copper in ppm if 99 ml of tap water contains 5 X 10 -5 parts of copper. |
Answers
The Answer to question 1 is: 0.68 g/ml
The Answer to question 2 is: 405.42 g
The Answer to question 3 is: 19.44 ml
The Answer to question 4 is: 1.28
The Answer to question 5 is: 12.50 mg
The Answer to question 6 is: 35.00 ml
The Answer to question 7 is: 278.40 g
The Answer to question 8 is: 28.32 % w/v
The Answer to question 9 is: 0.72 % w/w
The Answer to question 10 is: 300 mg
The Answer to question 11 is: 0.39 %
The Answer to question 12 is: 1 : 500
The Answer to question 13 is: 225.81 mg
The Answer to question 14 is: 9.52 mg
The Answer to question 15 is: 20.00 mg/ml
The Answer to question 16 is: 100.00 mg/ml
The Answer to question 17 is: 0.67 mg/ml
The Answer to question 18 is: 0.51 ppm