The concentration of the final solution is equal to $0.0433$ $M$.
Work Step by Step
1. Find the concentration after the dilution: $C_1 * V_1 = C_2 * V_2$ $0.866*25.0= C_2 *500$ $21.65 = C_2 *500$ $C_2 =0.0433$ $M$.
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