Question #019f5

1 Answer
Sep 24, 2015

Answer:

#"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 #"0.50 g/mL"#.

What that means is that every miligram of stock solution will contain #"0.50 g"# of atropine.

Convert the needed dosage from miligrams to grams by using the fact that #"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 #"1 mL"# of stock solution, since he needs a dosage that is smaller than #"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.