Question

In a 1-L volumetric flask, 20 mL of a 5-M solution was introduced and then filled with water to the mark. What is the new concentration of the diluted solution?

Answer 1

Solution:

C₁ = 5 M

V₁ = 20 mL

C₂ = unknown

V₂ = 1 L = 1000 mL

Thus,

C₂ = C₁ × V₁ / V₂

C₂ = (5 M × 20 mL) / (1000 mL) = 0.1 M

C₂ = 0.1 M

Answer: The concentration of the diluted solution is 0.1 M