How many millilieters of a 12% (v/v) propyl alcohol solution would you need to obtain 5.7 mL of propyl alcohol?

1 Answer
Dec 17, 2016

Answer:

#"48 mL"#

Explanation:

A solution's volume by volume percent concentration, #"% v/v"#, is a measure of how many milliliters of solute it contains in #"100 mL"# of solution.

In your case, a #"12% v/v"# solution will contain #"12 mL"# of solute for every #"100 mL"# of solution.

This means that in order to have #"5.7 mL"# of solute, you need to have

#5.7 color(red)(cancel(color(black)("mL solute"))) * "100 mL solution"/(12color(red)(cancel(color(black)("mL solute")))) = color(darkgreen)(ul(color(black)("48 mL solution")))#

The answer is rounded to two sig figs.