2.70g NaOH = 0.0675 moles
That means your NaOH solution is .0675M
adding water to make it 4L means you have increased the volume by a factor of 4/.025 = 160
So, the concentration is reduced by a factor of 160 to 0.00042M
If water is added to a 25.0 mL sample of 2.70 g/L NaOH(aq) until the volume becomes 4.00 L, find the concentration of the final solution in mol/L.
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