320 Student Learning Advisory Service Contact us Please come and see us if you need any academic advice or guidance. Canterbury AT A GLANCE/ PHARMACY CALCULATIONS PERCENTAGE STRENGTHS Calculating the amount of substance in a concentration expressed as a percentage strength Our offices are next to Santander Bank Open Monday to Friday, 09.00 17.00 E: [email protected] T: 01227 824016 Medway We are based in room G0-09, in the Gillingham Building and in room DB034, in the Drill Hall Library. Open Monday to Friday, 09.00 17.00 E: [email protected] T: 01634 888884 Example 1 The Student Learning Advisory Service (SLAS) is part of the Unit for the Enhancement of Learning and Teaching (UELT) How much chloroform is contained in 500mL of a 2% v/v concentration? Acknowledgments All materials checked by Dr Scott Wildman, Dr Cleopatra Branch, Jerome Durodie and Andrew Lea, Medway School of Pharmacy, Anson Building, Central Avenue, Chatham Maritime, Chatham, Kent. ME4 4TB. This leaflet has been produced in conjunction with sigma Mathematics Support Centre Method Step 1: A percentage is a fraction with a base of 100. h ,2 %= 2 100 Step 2: By multiplication 2 500 = 100 *Remember, this is a v/v concentration. kent.slas Example 2 @unikentSLAS How much sodium chloride is contained in 1.25L of a 0.5% w/v concentration? www.kent.ac.uk/learning Method Q2 How much active ingredient is contained in the following? Step 1: By multiplication 0.5 1250 = . 100 *Remember, this is a w/v concentration. Example 3 How much glucose will be needed to make up 750mL of a 5% w/v concentration? Method Step 1: By multiplication 5 750 = . 100 Alternative Method Step 1: Convert the % into a decimal 5 %=

5 =0.05 100 Step 2: By multiplication 0.05750=. Q1 How much active ingredient is contained in the following? a) 100mL of 2% v/v b) 100mL of 0.5% v/v c) 120mL of 0.05% w/v d) 1.5L of 0.2% w/v e) 5mL of 0.04% v/v f) 100mL of 0.005% v/v g) 50mg of 5% w/w h) 120g of 0.2% v/w i) 1250mL of 20% v/v j) 50mcL of 0.2% w/v a) 568mL of 5% v/v b) 80mL of 2.5% v/v c) 15mL of 0.01% w/v d) 0.4L of 0.25% w/v e) 1500L of 0.2% w/v f) 10mL of 0.02% v/v g) 454g of 15% w/w h) 45mg of 0.02% w/w i) 75mcL of 0.5% w/v j) 1500mcL of 0.2% w/v Answers Q1 a) = 2mL. b) = 0.5mL. c) = 60mg. d) = 3g. e) = 2mcL. f) = 5mcL. g) = 2.5mg. h) = 0.24mL. i) = 250mL. j) = 0.1mg Q2 a) = 28.4mL. b) = 2mL. c) = 1.5mg. d) = 1g. e) = 3kg. f) = 2mcL. g) = 68.1g. h) = 9mcg. i) = 375mcg. j) = 3mg.

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