Practice problems

# Question
1 What is the density of 182 ml of a liquid that weighs 32 g ?
2 What is the weight in grams of 4 ml liquid, with a specific gravity of 0.56?
3 If a drug has specific gravity of 1.00. How many ml of drug do you need to get 75 g of drug?
4 What is the specific gravity of a 310 ml of liquid that weighs 251 g?
5 How many mg of a drug will be there in 10 ml of 0.10 % w/v timolol ophthalmic solution?
6 What is the volume of isopropyl alcohol required to make 350 ml of rubbing alcohol (70% v/v isopropyl alcohol)
7 How many grams of dextrose are required to prepare 3360 ml of 55 % 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 95 g of a drug in 2350 ml of water?
10 A pharmacist dispenses 95 ml of 1 % 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 : 506 as a percent strength.
12 Express 1.00 % as a ratio strength.
13 Calculate the milligrams of drug required to prepare 75 ml of a 1: 20 antiseptic solution.
14 How many milligrams of hexachlorophene should be used in compounding the following prescription?

Hexachlorophene 1 : 3000
Hydrophilic ointment ad 80 g
Sig. apply
15 Express 55 g in 250 ml as mg/ml.
16 Express 6 % w/v as mg/ml.
17 Express 1: 2400 (w/v) as mg/ml.
18 Calculate the concentration of copper in ppm if 74 ml of tap water contains 8 X 10 -5 parts of copper.

Answers

The Answer to question 1 is: 0.18 g/ml

The Answer to question 2 is: 2.24 g

The Answer to question 3 is: 75.00 ml

The Answer to question 4 is: 0.81

The Answer to question 5 is: 10.00 mg

The Answer to question 6 is: 245.00 ml

The Answer to question 7 is: 1848.00 g

The Answer to question 8 is: 1.00 % w/v

The Answer to question 9 is: 3.89 % w/w

The Answer to question 10 is: 50 mg

The Answer to question 11 is: 0.20 %

The Answer to question 12 is: 1 : 100

The Answer to question 13 is: 3750.00 mg

The Answer to question 14 is: 26.67 mg

The Answer to question 15 is: 220.00 mg/ml

The Answer to question 16 is: 60.00 mg/ml

The Answer to question 17 is: 0.42 mg/ml

The Answer to question 18 is: 1.08 ppm