Percentage strength: parts of a substance per one hundred total parts Solid or gas in a...

 

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Percentage strength: parts of a substance per one hundred total parts Solid or gas in a liquid: percent weight-in-volume (% w/v) W x 9 solid or gas = 9 solid or gas 100%) x% v 100 mL solution mL solution Liquid in a liquid: percent volume-in-volume (% v/v) v = x% v Hydrogen Peroxide, USP 3% First Aid Antiseptic xml liquid 100 mL solution = (x mL liquid 100%) mL solution Solid in solid or semisolid (gel): percent weight-in-weight (% w/w) W x% == xg solid W 100 g solid solution = x 9 solid 9 solid solution 100% Sometimes the "w/v", "v/v", or "w/w" is not given, and you must make the appropriate assumption based on the substances you are using. How much calamine is needed to make 50 g of a 10% w/w ointment? How many milliliters of mineral oil (s.g.=0.8) is needed to compound this ointment if 42 g of Vaseline are used as the ointment base? CLOBEX lotion contains 0.05% w/v clobetasol propionate in 118 mL containers. Calculate the content of drug, in milligrams. A tissue plasminogen activator (TPA) ophthalmic solution is prepared to contain 25 g/100 L. Calculate the percentage concentration of TPA in the solution. What is the percentage strength (w/w) of a solution made by dissolving 62.5 g of potassium chloride in 187.5 mL of water? Percentage strength: parts of a substance per one hundred total parts Solid or gas in a liquid: percent weight-in-volume (% w/v) W x 9 solid or gas = 9 solid or gas 100%) x% v 100 mL solution mL solution Liquid in a liquid: percent volume-in-volume (% v/v) v = x% v Hydrogen Peroxide, USP 3% First Aid Antiseptic xml liquid 100 mL solution = (x mL liquid 100%) mL solution Solid in solid or semisolid (gel): percent weight-in-weight (% w/w) W x% == xg solid W 100 g solid solution = x 9 solid 9 solid solution 100% Sometimes the "w/v", "v/v", or "w/w" is not given, and you must make the appropriate assumption based on the substances you are using. How much calamine is needed to make 50 g of a 10% w/w ointment? How many milliliters of mineral oil (s.g.=0.8) is needed to compound this ointment if 42 g of Vaseline are used as the ointment base? CLOBEX lotion contains 0.05% w/v clobetasol propionate in 118 mL containers. Calculate the content of drug, in milligrams. A tissue plasminogen activator (TPA) ophthalmic solution is prepared to contain 25 g/100 L. Calculate the percentage concentration of TPA in the solution. What is the percentage strength (w/w) of a solution made by dissolving 62.5 g of potassium chloride in 187.5 mL of water?