*Solve the question with arbitrary number* Thank you! 5. If (a given #) mL of (g
ID: 1064673 • Letter: #
Question
*Solve the question with arbitrary number* Thank you!
5. If (a given #) mL of (given percent) alcohol solution are diluted with water to (a given # of) liters, what will be the percent of the resulting solution? (Answer to the nearest tenth of a percent - one decimal point)
6. Bactroban ointment contains (a given percent) mupirocin . How many grams of PEG (an ointment base) must be mixed with the contents of a (a given # of) of Bactroban ointment to prepare an ointment having a concentration of (a given # of mg per gram)? (Answer to the nearest gram - no decimal point)
Explanation / Answer
5. Consider w/v solutions. Suppose we have a 100 mL 10% solution of alcohol and we dilute the said solution with water to 1 L. We are supposed to find the w/v percentage of the new solution.
100 mL solution contains 10 g alcohol.
The new volume is 1 L = 1000 mL. Since no new solute was added, the new solution must contain 10 g solute. Therefore, percentage of solute in the new solution is (10)*(100/1000) = 1.
The new solution is 1.0% w/v (ans).
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