Chemistry 122 s

Question

A quantity of 5.0 mL of 0.85 M glucose solution is diluted to a new volume of 250. mL. What is the concentration, in mol/L, of the new solution?

Answer 1

The question asks, 5 ml of a 0.85 M solution of glucose is diluted to 250 ml. What is the new concentration in mol/L?

This questions involves dilution of the same glucose solution, and therefore you can use the following equation, called the “dilution formula” which states

Molarity1 x Volume1 = Molarity2 x Volume2

mol/L1 x Liters1 = mol/L2. x Liters2

Given:

M1 = 0.85M (concentration 1)

V1 = 0.005L (volume 1, after converting ml to L)

M2? (new concentration 2 to be found in mol/L)

V2 = 0.250L (volume 2, after converting ml to L)

plugging the numbers into the dilution formula and solving for M2 (concentration 2):

(0.85)(0.005) = (M2)(0.250) =

0.00425 = (M2)(0.250) =

M2 = 0.017 mol/L the new concentration