Answer to Question #159198 in Chemistry for Dany

Question

How could you prepare 250 ml 0.20M using only a solution of 1.0M NaCl and water?

Answer 1

According to the equation:

C₁ × V₁ = C₂ × V₂

where C₁ - the initial concentration, V₁ - the volume of the initial solution, C₂ - the final volume, V₂ - the volume of the final solution.

From here, the volume of the initial solution required:

V1 = C₂ × V₂ / C₁ = 250 ml × 0.20 M / 1.0 M = 50 ml

As a result, to prepare 250 ml of 0.20M NaCl, take 50 ml of 1.0M NaCl solution and add 200 ml of water.