Practice problems
| # | Question |
|---|---|
| 1 | What is the density of 195 ml of a liquid that weighs 100 g ? |
| 2 | What is the weight in grams of 53 ml liquid, with a specific gravity of 1.36? |
| 3 | If a drug has specific gravity of 3.40. How many ml of drug do you need to get 60 g of drug? |
| 4 | What is the specific gravity of a 410 ml of liquid that weighs 138 g? |
| 5 | How many mg of a drug will be there in 15 ml of 0.30 % w/v timolol ophthalmic solution? |
| 6 | What is the volume of isopropyl alcohol required to make 690 ml of rubbing alcohol (70% v/v isopropyl alcohol) |
| 7 | How many grams of dextrose are required to prepare 80 ml of 36 % 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 65 g of a drug in 1600 ml of water? |
| 10 | A pharmacist dispenses 70 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 : 59 as a percent strength. |
| 12 | Express 1.50 % as a ratio strength. |
| 13 | Calculate the milligrams of drug required to prepare 65 ml of a 1: 85 antiseptic solution. |
| 14 |
How many milligrams of hexachlorophene should be used in compounding the following prescription? |
| 15 | Express 59 g in 400 ml as mg/ml. |
| 16 | Express 19 % w/v as mg/ml. |
| 17 | Express 1: 900 (w/v) as mg/ml. |
| 18 | Calculate the concentration of copper in ppm if 16 ml of tap water contains 6 X 10 -5 parts of copper. |
Answers
The Answer to question 1 is: 0.51 g/ml
The Answer to question 2 is: 72.08 g
The Answer to question 3 is: 17.65 ml
The Answer to question 4 is: 0.34
The Answer to question 5 is: 45.00 mg
The Answer to question 6 is: 483.00 ml
The Answer to question 7 is: 28.80 g
The Answer to question 8 is: 1.00 % w/v
The Answer to question 9 is: 3.90 % w/w
The Answer to question 10 is: 900 mg
The Answer to question 11 is: 1.69 %
The Answer to question 12 is: 1 : 66
The Answer to question 13 is: 764.71 mg
The Answer to question 14 is: 43.75 mg
The Answer to question 15 is: 147.50 mg/ml
The Answer to question 16 is: 190.00 mg/ml
The Answer to question 17 is: 1.11 mg/ml
The Answer to question 18 is: 3.75 ppm