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?
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.