To solve this problem, we can use the formula:
C1V1 = C2V2
where C1 is the initial concentration, V1 is the initial volume, C2 is the final concentration, and V2 is the final volume.
We are given:
C1 = 1.2 M
V1 = 23 mL
V2 = 50.0 mL
We can solve for C2 by plugging in the values:
C1V1 = C2V2
(1.2 M)(23 mL) = C2(50.0 mL)
C2 = (1.2 M)(23 mL) / (50.0 mL)
C2 = 0.552 M
Therefore, the new concentration of the solution is 0.552 M.