Practice problems
| # | Question |
|---|---|
| 1 | What is the density of 107 ml of a liquid that weighs 52 g ? |
| 2 | What is the weight in grams of 78 ml liquid, with a specific gravity of 2.66? |
| 3 | If a drug has specific gravity of 2.20. How many ml of drug do you need to get 65 g of drug? |
| 4 | What is the specific gravity of a 295 ml of liquid that weighs 268 g? |
| 5 | How many mg of a drug will be there in 20 ml of 0.20 % w/v timolol ophthalmic solution? |
| 6 | What is the volume of isopropyl alcohol required to make 920 ml of rubbing alcohol (70% v/v isopropyl alcohol) |
| 7 | How many grams of dextrose are required to prepare 1380 ml of 43 % solution? |
| 8 | Calculate the % w/v of 10 w/w % NaCl solution having a specific gravity of 1.068. |
| 9 | Calculate the % w/w of a solution prepared by dissolving 90 g of a drug in 2600 ml of water? |
| 10 | A pharmacist dispenses 5 ml of 17 % 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 : 711 as a percent strength. |
| 12 | Express 0.30 % as a ratio strength. |
| 13 | Calculate the milligrams of drug required to prepare 30 ml of a 1: 70 antiseptic solution. |
| 14 |
How many milligrams of hexachlorophene should be used in compounding the following prescription? |
| 15 | Express 11 g in 100 ml as mg/ml. |
| 16 | Express 39 % w/v as mg/ml. |
| 17 | Express 1: 3100 (w/v) as mg/ml. |
| 18 | Calculate the concentration of copper in ppm if 35 ml of tap water contains 6 X 10 -5 parts of copper. |
Answers
The Answer to question 1 is: 0.49 g/ml
The Answer to question 2 is: 207.48 g
The Answer to question 3 is: 29.55 ml
The Answer to question 4 is: 0.91
The Answer to question 5 is: 40.00 mg
The Answer to question 6 is: 644.00 ml
The Answer to question 7 is: 593.40 g
The Answer to question 8 is: 10.68 % w/v
The Answer to question 9 is: 3.35 % w/w
The Answer to question 10 is: 850 mg
The Answer to question 11 is: 0.14 %
The Answer to question 12 is: 1 : 333
The Answer to question 13 is: 428.57 mg
The Answer to question 14 is: 11.36 mg
The Answer to question 15 is: 110.00 mg/ml
The Answer to question 16 is: 390.00 mg/ml
The Answer to question 17 is: 0.32 mg/ml
The Answer to question 18 is: 1.71 ppm