Answer to Question #172523 in Chemistry for Tsion

Question

25mL of the 40% ethanol solution is used to prepare the 10% ethanol. What is the final volume of the solution? And, how much water must be added to do the dilution?

Answer 1

Dilution factor refers to the ratio of the volume of the initial (concentrated) solution to the volume of the final (dilute) solution¹, that is, the ratio of V₁ to V₂ or V₁ : V₂. A dilution factor, DF, can be calculated: DF = V₂ / V₁.

Dilution factor may also be expressed as the ratio of the concentration of stock solution (C₁) to the concentration of the final diluted solution (C₂). Stock Solution Concentration (C₁) is the concentration of the stock solution.

Dillution factor is DF = V₂ / V₁ = C₁ / C₂

DF = 40 / 10 = 4

V₂ = DF x V₁ = 4 x 25 = 100 ml