Final answer:
The new concentration of the solution is 0.142857 M.
Step-by-step explanation:
To find the new concentration of the solution, we can use the equation:
C1V1 = C2V2
where C1 is the initial concentration, V1 is the initial volume, C2 is the final concentration, and V2 is the final volume.
Plugging in the given values:
0.200 M x 500.0 mL = C2 x 700.0 mL
Simplifying the equation, we can solve for C2:
C2 = (0.200 M x 500.0 mL) / 700.0 mL
C2 = 0.142857 M
Therefore, the new concentration of the solution is 0.142857 M.