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  4. 4.28 g of NaOH is dissolved in water and the solution is made to 250 cc. What will be the molarity of the solution?

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Q. $4.28 \,g$ of $NaOH$ is dissolved in water and the solution is made to $250 \,cc$. What will be the molarity of the solution?

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Solution:

No. of moles of $NaOH =\frac{4.28}{40} = 0.107$
Volume of solution $= 250 cm ^{3}$
$ M = \frac { n}{V(in L)} = \frac{0.107}{250} \times 1000 = 0.428\, mol\, L^{-1}$