Pharmaceutical calculation Flashcards
What is the equation for the percentage of moles of solute in one litre of solvent by mass?
Mass of solute/ Mass of solution x 100
What is the equation for the percentage of moles of solute in one litre of solvent by volume?
Volume of solute/ Volume of solution x 100
Equation for mole fraction
Mass of solute/ Total moles of solution
What’s the equation for the number of moles in ONE litre of solvent? (MOLARITY) [M]
Moles of solute (moles) / Volume of solution (Litre)
What’s the equation for the number of moles of solute in ONE kg of solvent? (MOLALITY) [m]
Moles of solute (moles) / Mass of solvent (kg)
Why is molality preferred over molarity?
It is dependent of solution teperature (volume can change with temperatre) it is unaffected by addition of another solute.
What is %w/w ?
The grams of drug in 100 grams of the product.
What is %w/v ?
The grams of drug in 100 ml of the product
What %v/v ?
The millimetres of drug in 100 ml of the product
