Chemistry problems

Question

1.Suppose you have 200.0 ml of o.2 M NaOH solution. If you dilute this to 500.0 ml of with water, what is the new molarity?

2 . Given 240 ml of 0.5M NaNO3 solution, to what volume do you need to dilute this to make a 0.2M solution?

Answer 1

For these problems, you would use the equation M₁V₁ = M₂V₂ where M₁ and V₁ refers to the Molarity and Volume of the initial solution, respectively, and M₂ and V₂ refers to the Molarity and Volume of the diluted solution

1.) M_{2 =} M₁V₁/V_{2 =} (0.2 L*0.2 M)/0.5 L = 0.08 M

The diluted solution will have a Molarity of 0.08 M.

2.) V₂ = M₁V₁/M₂ = (0.240 L * 0.5 M)/0.2 M = 0.6 L

To achieve this 0.2 M NaNO₃, the solution would need to be diluted to 0.6 L, or 600 mL.