Final answer:
To prepare 0.500 L of 0.500 M HNO₃, you would need 22.3 mL of a stock solution of 11.2 M HNO₃.
Step-by-step explanation:
To calculate the volume of the stock solution needed to prepare a certain concentration of a solution, we can use the formula:
(C1)(V1) = (C2)(V2)
where C1 and V1 are the concentration and volume of the stock solution, and C2 and V2 are the desired concentration and volume of the final solution.
In this case, we have:
(11.2 M)(V1) = (0.500 M)(0.500 L)
Solving for V1, we find that V1 = 0.0223 L = 22.3 mL.