Answer
1.00 M
Work Step by Step
$C_{1}V_{1}=C_{2}V_{2}$
$\implies C_{2}=C_{1}\times\frac{V_{1}}{V_{2}}$
$=4.00\,M\times\frac{50.0\,mL}{200.\,mL}=1.00\,M$
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