>> I got W=40.00/0.2l=200 <<
Let's see, molarity = moles / liters, and moles = grams / MW, so the molarity of the NaOH solution will be
4.00 g / 40.00 g/mol = 0.100 mol = 0.500 mol/L or 0.500 M
0.200 L 0.200 L
I'm just "plugging in" in order to calculate the moles and molarity. 
Steve
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