Chapter Questions
How many grams of salicylic acid and benzoic acid should be used in preparing 100 grams of an ointment containing $12 \%$ and $6 \%$ of each, respectively?
How many grams of boric acid should be used in compounding the following prescription:
What is the amount of potassium permanganate (in g) that should be used in compounding the following prescription?$\mathrm{R}$Potassium permanganate $0.03 \%$Aqua ad $\quad 600 \mathrm{~mL}$
What is the percentage strength of boric acid if 50 grams are dissolved in $350 \mathrm{ml}$ of deionized distilled water?
In preparing $500 \mathrm{~mL}$ of a topical formulation, a community pharmacist used $8 \mathrm{~mL}$ of liquid phenol. What is the percentage strength $(\mathrm{v} / \mathrm{v})$ of the liquefied phenol in this topical formulation?
In preparation of $100 \mathrm{~mL}$ mouthwash, a pharmacist used $250 \mathrm{mg}$ of menthol. What is the percentage (w/v) of menthol in this mouthwash?
What is the amount of codeine sulfate to be used in compounding the following prescription?
What is the amount of methyl salicylate in $(\mathrm{mL})$ that should be used in compounding the following prescription?$\mathrm{R}$Methyl salicylate & $6 \%$ Isopropanol & $150 \mathrm{~mL}$
What is the amount of peppermint oil (in $\mathrm{mL}$ ) that should be used in compounding aromatic water in the following prescription?$\mathrm{R}_x$Peppermint oil $2 \%$Water to $220 \mathrm{~mL}$
How many grams of drug A should be dissolved in $140 \mathrm{~mL}$ of distilled water to prepare $8 \%(w / v)$ solution?
How many grams of a drug substance are needed to prepare $200 \mathrm{~mL}$ of a $10 \%(w / w)$ solution in water?
How many grams of a dorzolamide are needed to prepare $60 \mathrm{~mL}$ of a $2 \%$ (w/w) ophthalmic solution in isotonic solution?
Express each of the following concentrations as a ratio strength:a. $2 \mathrm{~g}$ of active ingredient in $50 \mathrm{~mL}$ of the solutionb. $0.2 \mathrm{mg}$ of active ingredient in $2 \mathrm{~mL}$ of the solutionc. $25 \mathrm{mg}$ of active ingredient in $5 \mathrm{~mL}$ of the solutiond. $1 \mathrm{mg}$ of active ingredient in $1 \mathrm{~mL}$ of the solution
How many milligrams of a benzalkonium chloride should be used in preparing 5 liters of a $0.001 \%$ solution?
A liquid medication contains $2.5 \mathrm{mg}$ of fluoxetine hydrochloride per 75 milliliters. Express the milligram percent ( $\mathrm{mg} \%)$ concentration of this preparation.
An injection contains $50 \mathrm{mg}$ pentobarbital sodium in each $\mathrm{mL}$ of solution. What is the percentage strength $(w / v)$ of the solution?
If $500 \mathrm{~g}$ of dextrose monohydrate are dissolved in enough water to make $20 \mathrm{~L}$, what is the percentage strength (w/v) of the solution?
How many milliliters of a $0.9 \%$ (w/v) of sodium chloride can be prepared from $11.25 \mathrm{~g}$ of sodium chloride?
If $50 \mathrm{~g}$ of magnesium citrate are dissolved in enough water to make $2.5 \mathrm{~L}$, what is the percentage strength $(w / v)$ of the solution?
What is the percentage strength (w/w) of a solution made by dissolving $250 \mathrm{~g}$ of potassium chloride in $750 \mathrm{~mL}$ of water?
If $100 \mathrm{mg}$ of docusate sodium are dissolved in water and the volume is made up to $10 \mathrm{~mL}$, what is the percentage strength (w/w) of the solution?
A formula for a mouth rinse contains $1 / 10 \%(w / v)$ of zinc chloride. How many grams of zinc chloride should be used in preparing 10 liters of the mouth rinse?
What is the percentage strength (w/w) of a solution made by dissolving $0.3 \mathrm{~g}$ of cimetidine hydrochloride in $90 \mathrm{~g}$ of water?
How many milliliters of resorcinol monoacetate liquid should be used to prepare a liter of a $15 \%(\mathrm{v} / \mathrm{v})$ lotion?
How many milligrams of sodium fluoride must be dissolved in $500 \mathrm{~mL}$ of water to make $0.05 \%(\mathrm{w} / \mathrm{w})$ solution?
If one liter of a solution contains $250 \mathrm{~g}$ of active drug, what is its percentage strength, expressed as $w / v$ ?
How many grams of calcium carbonate should be used in preparing $100 \mathrm{~mL}$ of $10 \%$ calcium carbonate suspension?
If a patient is instructed to take $250 \mathrm{~mL}$ of $16 \% \mathrm{w} / \mathrm{v}$ of an oral solution, how many grams of the drug will he consume?
How many grams of iodine are represented in a $20 \mathrm{~mL}$ of $20 \%$ w/v iodine solution?
If $230 \mathrm{~mL}$ of a solution contains $46 \mathrm{mg}$ of drug, what is the strength of this solution in percent $(\mathrm{w} / \mathrm{v})$ ?
If $250 \mathrm{~mL}$ of a $0.1 \%$ solution is mixed with $150 \mathrm{~mL}$ of a $0.3 \%$ solution, what will be the strength (percent $w / v$ ) of the final solution?
What is the percent (w/v) strength of a solution that has $500 \mathrm{mg}$ of drug in $200 \mathrm{~mL}$ ?
What is the percentage strength (in $w / v$ ) of a $5 \mathrm{mg}$ in $5 \mathrm{~mL}$ solution?
While preparing $250 \mathrm{~mL}$ of $2 \%(w / v)$ solution, a pharmacist mistakenly used only $4.5 \mathrm{~g}$ of drug. How many more milligrams of this drug are needed to get the correct strength?