pharmaceutical calculations Flashcards
1
Q
In what ways can the concentration of a drug be expressed?
A
1) quantity per volume
2) percentage concentrations
3) ratios
4) parts
5) molarity
2
Q
When is quantity per volume used?
A
liquid preparations
3
Q
What does 10 g/l aqueous solution of sodium chloride mean?
A
10 grams of sodium chloride dissolved in 1 litre of water
4
Q
When are percentage concentrations used?
A
solid/liquid preparations
5
Q
What does % w/v mean?
A
grams in 100 ml of solution
6
Q
What does % w/w mean?
A
grams in 100 g of product
7
Q
What does % v/v mean?
A
millilitres in 100 ml of product
8
Q
When are ratio concentrations used?
A
very dilute solutions
9
Q
What does 1:5000 mean?
A
1 gram dissolved in 5000 ml of solution
10
Q
What is a 1M solution?
A
1 mole of drug per 1 litre of solvent
