Answer to Question #108758 in General Chemistry for Nicole

Question

Paul is making a potion. He needs a concentration of 1.55 mil/L to put into a 500mL bottle. If he has a bottle of concentrate at 4.90 mol/L outline how he will make the dilute solution he needs

Answer 1

$$n_{solute} = cV = 1.55*0.5 = 0.775mol$$

$$V_2 = n_{solute}/c = 0.775/4.90 = 0.158L = 158mL$$

$$\Delta V = V_1 - V_2 = 500 - 158 = 342 mL$$

Accordingly, it is necessary to bring a solution with a concentration of 4.90 M with a volume of 342 mL to a mark of 500 mL with water.