Answer
4.2 mL
Work Step by Step
We find:
$M_{1}V_{1}=M_{2}V_{2}$
$(6.00\,M)V_{1}=(0.50\,M)(50.0\,mL)$
$\implies V_{1}=\frac{(0.50\,M)(50.0\,mL)}{6.00\,M}=4.2\,mL$
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