Question

an order is written for 500 ml of a 12% solution. i have a 20% solution in stock. how much stock solution and how much diluent are needed to compound this order.
my answer
300ml stock solution and 200 diluent
is that correct?

Answer 1

No, that is not correct.

To find the amount of stock solution needed, we can use the formula:

(stock concentration) x (stock volume) = (final concentration) x (final volume)

Plugging in the values we have:

(0.20) x (x) = (0.12) x (500)
0.20x = 60
x = 300 ml

So we need 300 ml of the 20% stock solution.

To find the amount of diluent needed, we can subtract the volume of stock solution from the final volume:

500 ml - 300 ml = 200 ml

So we need 200 ml of diluent (which is usually water or saline) to make the final solution.

Therefore, the correct answer is:

300 ml of the 20% stock solution and 200 ml of diluent are needed to compound this order.