Question

if .40 L if water is added to the volume of cup 3, what would be the new molarity of a 2 M solution of kool-aid

Answer 1

0.7692 M ≅ 0.77 M.

Step-by-step explanation:

• It is known that the no. of millimoles of a solution before dilution is equal to the no. of millimoles of the solution after the dilution.

• It can be expressed as:

(MV) before dilution = (MV) after dilution.

M before dilution = 2.0 M, V before dilution = 0.25 L.

M after dilution = ??? M, V after dilution = 0.25 L + 0.40 L = 0.65 L.

∴ M after dilution = (MV) before dilution/(V) after dilution = (2.0 M)(0.25 L)/(0.65 L) = 0.7692 M ≅ 0.77 M.