Question

Question #019f5

Answer 1

`"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.