Answer to Question #96237 in General Chemistry for Beth

Question

1. In the laboratory you dilute 3.81 mL of a concentrated 6.00 M perchloric acid solution to a total volume of 175 mL. What is the concentration of the dilute solution? ___M

2. In the laboratory you dilute 3.15 mL of a concentrated 3.00 M hydrobromic acid solution to a total volume of 100 mL. What is the concentration of the dilute solution? ___M

Answer 1

The Molarity of new solution can be calculated using the formulae :

M₁V₁ = M₂V₂

where M₁ = Initial molarity, M₂= final molarity , V₁= Initial volume, V₂= Final volume

(1) M₁= 6 M, M₂= ? , V₁= 3.81 mL, V₂= 175 mL

Thus : 6 * 3.81 = M₂ * 175

M₂ =0.1306 M

(2) M₁= 3 M, M₂= ? , V₁= 3.15 mL, V₂= 100 mL

Thus : 3 * 3.15 = M₂ * 100

M₂ =0.0945 M