The formula for 100 mL of pentobarbital sodium elixir calls for 0.75 mL of orange oil. Using alcohol as a diluent and a 10-mL graduate calibrated in 1-mL units, how could you obtain the desired quantity of orange oil?

See explanation below

Step-by-step explanation:

0.75 ml equals ¾ ml

This says that if we take 3 ml of orange oil and 1 ml of alcohol, we obtain a solution of 4 ml, 3 of which are orange oil. That is to say, 1 ml of this solution contain ¾ = 0.75 ml of orange oil.

So, we proceed to fill our 10-mL graduate calibrated in 1-mL units, we add 3 ml of orange oil and 1 ml of alcohol, stir it and 1 ml of this solution will contain 0.75 ml of alcohol.