Practice problems
| # | Question |
|---|---|
| 1 | What is the density of 183 ml of a liquid that weighs 239 g ? |
| 2 | What is the weight in grams of 423 ml liquid, with a specific gravity of 0.88? |
| 3 | If a drug has specific gravity of 0.80. How many ml of drug do you need to get 25 g of drug? |
| 4 | What is the specific gravity of a 475 ml of liquid that weighs 305 g? |
| 5 | How many mg of a drug will be there in 20 ml of 0.25 % w/v timolol ophthalmic solution? |
| 6 | What is the volume of isopropyl alcohol required to make 910 ml of rubbing alcohol (70% v/v isopropyl alcohol) |
| 7 | How many grams of dextrose are required to prepare 450 ml of 43 % solution? |
| 8 | Calculate the % w/v of 16 w/w % NaCl solution having a specific gravity of 1.11. |
| 9 | Calculate the % w/w of a solution prepared by dissolving 60 g of a drug in 1800 ml of water? |
| 10 | A pharmacist dispenses 95 ml of 3 % 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 : 968 as a percent strength. |
| 12 | Express 0.80 % as a ratio strength. |
| 13 | Calculate the milligrams of drug required to prepare 80 ml of a 1: 340 antiseptic solution. |
| 14 |
How many milligrams of hexachlorophene should be used in compounding the following prescription? |
| 15 | Express 75 g in 650 ml as mg/ml. |
| 16 | Express 36 % w/v as mg/ml. |
| 17 | Express 1: 2000 (w/v) as mg/ml. |
| 18 | Calculate the concentration of copper in ppm if 92 ml of tap water contains X 10 -6 parts of copper. |
Answers
The Answer to question 1 is: 1.31 g/ml
The Answer to question 2 is: 372.24 g
The Answer to question 3 is: 31.25 ml
The Answer to question 4 is: 0.64
The Answer to question 5 is: 50.00 mg
The Answer to question 6 is: 637.00 ml
The Answer to question 7 is: 193.50 g
The Answer to question 8 is: 17.76 % w/v
The Answer to question 9 is: 3.23 % w/w
The Answer to question 10 is: 150 mg
The Answer to question 11 is: 0.10 %
The Answer to question 12 is: 1 : 125
The Answer to question 13 is: 235.29 mg
The Answer to question 14 is: 1.61 mg
The Answer to question 15 is: 115.38 mg/ml
The Answer to question 16 is: 360.00 mg/ml
The Answer to question 17 is: 0.50 mg/ml
The Answer to question 18 is: 1.09 ppm