Answer
This is not the correct method, because it does not produce a 0.500M solution.
Work Step by Step
1. Find the concentration after the dilution:
$C_1 * V_1 = C_2 * V_2$
$1.00*125= C_2 *300$
$125 = C_2 *300$
$C_2 =0.417\ M$
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