Question 7.sp.5: What volume of a 5.0% (w/v) solution of ketamine contains 75...

[1] Identify the known quantities and the desired quantity.

5.0% (w/v) ketamine solution
75 mg                                         ? mL ketamine
known quantities                       desired quantity

[2] Write out the conversion factors.
• Use the weight/volume percent concentration to set up conversion factors that relate grams of ketamine to mL of solution. Since percent concentration is expressed in grams, a mg–g conversion factor is needed as well.

[3] Solve the problem.
• Multiply the original quantity by the conversion factors to obtain the desired quantity.