If 5.0cm‾³ of 0.200 mol dm‾³ Na2CO3 was diluted to 250cm‾³ solution; what would be the concentration of the resulting solution?

A. 0.004 mol dm‾³
B. 0.020 mol dm‾³
C. 0.200 mol dm‾³
D. 0.400 mol dm‾³

Correct Answer:

Option A = 0.004 mol dm‾³

Explanation

M₁V₁ =M₂V₂

M₁ = initial molarity
V₁ = initial volume in liters
M₂ = final molarity
V₂ = final volume in liters

0.200 X 5.00 = M₂ X 250

M₂ = ¹/₂₅₀

M₂ = 0.004 moldm^-3