A 569 mL NaCl solution is diluted to a volume of 1.11 L and a concentration of 6.00 M . What was the initial concentration C1?

Question

Express your answer with the appropriate units.

Answer 1

Be sure to use correct units on both sides of the equation.

V1C1 =V2C2

V1 = 569 ml

C1 = ?

V2 = 1.11 L x 1000 ml/L = 1110 mls (note to change to mls to be consistent with V1)

C2 =6.00 M

(569 ml)(C1) = (1110 ml)(6.00 M)

C1 = (1110 ml)(6.00 M) / 569 ml

C1 = 11.7 M (note the units of C1 are the same as for C2, i.e. M)