Question

A lab technician uses a 0.25-mol/L sodium carbonate stock solution, Na2CO3(aq), to prepare 250 mL of 0.010-mol/L solution. How much of the stock solution should be used?

Answer 1

The dilution coefficient equals:

n = c₁/c₂ = 0.25 mol/L / 0.010 mol/L = 25

From here, the volume of the stock solution that must be used is:

V₁ = V₂ / n = 10 mL

Answer: 10 mL