Answer:
0.2 grams of tetracaine hydrochloride
Step by step explanation:
To determine the required volume of each solution needed to prepare the prescription, we need to know the desired dose of each ingredient and the concentration of the stock solution.
Let's assume we want to prepare a prescription that contains 10 milliliters (ml) of a 2% w/v solution of tetracaine hydrochloride and 5 ml of a 1:1000 w/v solution of epinephrine hydrochloride.
For the tetracaine hydrochloride solution:
2% w/v means 2 grams of tetracaine hydrochloride per 100 ml of solution.
Therefore, to prepare 10 ml of a 2% w/v solution, we need:
(2 grams / 100 ml) x 10 ml = 0.2 grams of tetracaine hydrochloride.
For the epinephrine hydrochloride solution:
1:1000 w/v means 1 gram of epinephrine hydrochloride per 1000 ml of solution.
Therefore, to prepare 5 ml of a 1:1000 w/v solution, we need:
(1 gram / 1000 ml) x 5 ml = 0.005 grams of epinephrine hydrochloride.
So, we need 0.2 grams of tetracaine hydrochloride and 0.005 grams of epinephrine hydrochloride to prepare the prescription.