Practice problems
| # | Question |
|---|---|
| 1 | What is the density of 58 ml of a liquid that weighs 20 g ? |
| 2 | What is the weight in grams of 191 ml liquid, with a specific gravity of 2.96? |
| 3 | If a drug has specific gravity of 1.60. How many ml of drug do you need to get 90 g of drug? |
| 4 | What is the specific gravity of a 365 ml of liquid that weighs 86 g? |
| 5 | How many mg of a drug will be there in 15 ml of 0.15 % w/v timolol ophthalmic solution? |
| 6 | What is the volume of isopropyl alcohol required to make 470 ml of rubbing alcohol (70% v/v isopropyl alcohol) |
| 7 | How many grams of dextrose are required to prepare 3940 ml of 20 % solution? |
| 8 | Calculate the % w/v of 1 w/w % NaCl solution having a specific gravity of 1.004. |
| 9 | Calculate the % w/w of a solution prepared by dissolving 50 g of a drug in 2450 ml of water? |
| 10 | A pharmacist dispenses 20 ml of 2 % 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 : 70 as a percent strength. |
| 12 | Express 6.50 % as a ratio strength. |
| 13 | Calculate the milligrams of drug required to prepare 60 ml of a 1: 365 antiseptic solution. |
| 14 |
How many milligrams of hexachlorophene should be used in compounding the following prescription? |
| 15 | Express 80 g in 300 ml as mg/ml. |
| 16 | Express 28 % w/v as mg/ml. |
| 17 | Express 1: 2700 (w/v) as mg/ml. |
| 18 | Calculate the concentration of copper in ppm if 78 ml of tap water contains 8 X 10 -5 parts of copper. |
Answers
The Answer to question 1 is: 0.34 g/ml
The Answer to question 2 is: 565.36 g
The Answer to question 3 is: 56.25 ml
The Answer to question 4 is: 0.24
The Answer to question 5 is: 22.50 mg
The Answer to question 6 is: 329.00 ml
The Answer to question 7 is: 788.00 g
The Answer to question 8 is: 1.00 % w/v
The Answer to question 9 is: 2.00 % w/w
The Answer to question 10 is: 100 mg
The Answer to question 11 is: 1.43 %
The Answer to question 12 is: 1 : 15
The Answer to question 13 is: 164.38 mg
The Answer to question 14 is: 26.39 mg
The Answer to question 15 is: 266.67 mg/ml
The Answer to question 16 is: 280.00 mg/ml
The Answer to question 17 is: 0.37 mg/ml
The Answer to question 18 is: 1.03 ppm