Answer to Question #172522 in Chemistry for Tsion

Question

120mL of water is added to 30mL of the 40% ethanol solution. What is the dilution factor? And, what is the concentration of the diluted solution?

Answer 1

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.

DF = 150/30 = 5

2) 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.

DF = C₁ / C₂

C₂ = C₁ / DF = 40 / 5 = 8%