Precentage Concentration

% w/w

• Percentage weight in weight

• g in 100g

% w/v

• Percentage weight in volume

• g in 100mL

% v/v

• Percentage volume in volume

• mL in 100mL

% v/w

• Percentage volume in weight

• mL in 100g

Percentage concentration formula

Percentage concentration =

Amount of drug (g) / Total volume (mL) x 100mL

You need to dissolve 300mg of aspirin in sterile water to make 250mL of aspirin solution prior to drinking

Calculate the percentage concentration (%w/v) of aspirin in the final solution.

0.12% w/v

One sachet of Beechams Cold and Flu Hot Lemon and Honey contains 600mg of paracetamol.

Calculate the percentage concentration, %w/v, of Paracetamol in the solution if one sachet is dissolved in 120mL of hot water. Give your answer to one decimal place

0.5% w/v

A 300 mg vial of vedolizumab is dissolved in 5 mL of sodium chloride 0.9% solution and then added to 245 mL of sodium chloride 0.9% solution.

Calculate the percentage strength, %w/v, of vedolizumab in the final solution.

Give your answer to 1 decimal place.

0.1% w/v

A 56 year old female has been prescribed sertraline 100mg/5mL

concentrated oral solution.

She must take 5mL of the concentrated solution and dilutes to a final volume of 125mL with water.

Calculate the percentage concentration (%w/v) of the final diluted solution. Give your answer to 2 decimal places.

0.08% w/v