Question

115mL of a 2.35M potassium fluoride (KF) solution is diluted with 1.28L of water. Why is the new concentration in molarity?

Answer 1

M1*V1 = M2*V2

M1 = 2.35 M KF
V1 = 115 mL = 0.115 L

V2 = 0.115 L + 1.28 L = 1.395 L
M2 - ?

M1*V1 = M2*V2
2.35 *0.115 = M2 *1.395
M2 = 2.35 *0.115/1.395 = 0.194 M