Question 019f5

Sep 24, 2015

$\text{0.65 mL}$

Explanation:

So, you know that your patient needs 325 mg of atropine.

Moreover, you know that your stock solution of atropine has a concentration of $\text{0.50 g/mL}$.

What that means is that every miligram of stock solution will contain $\text{0.50 g}$ of atropine.

Convert the needed dosage from miligrams to grams by using the fact that $\text{1 g" = "1000 mg}$

325color(red)(cancel(color(black)("mg"))) * "1 g"/(1000color(red)(cancel(color(black)("mg")))) = "0.325 g"

Looks like you needs to give your patient les than $\text{1 mL}$ of stock solution, since he needs a dosage that is smaller than $\text{0.50 g}$.

More specifically, you need to give him

0.325color(red)(cancel(color(black)("g"))) * "1 mL"/(0.50color(red)(cancel(color(black)("g")))) = color(green)("0.65 mL")#

If you take 65 mL of a solution that contain 0.050 g atropine per mililiter, you get a dosage of 0.325 g of atropine.