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Molarity

5.0 g of sodi...

Question

5.0 g of sodium hydroxide (molar mass 40 g $m o l^{- 1}$ ) is dissolved in little quantity of water and the solution is diluted up to 100 ml. What is the molarity of the resulting solution?

0.1 mol dm

^{- 3}

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1.0 mol dm

^{- 3}

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0.125 mol dm

^{- 3}

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1.25 mol dm

^{- 3}

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Solution

The correct option is D 1.25 mol dm $^{- 3}$
Molarity is a unit of the concentration measuring the number of moles of a solute per litre of solution.

Moles of solute is $\frac{5}{40} = 0.125 m o l e s$

Volume of the solution in litres is $100 / 1000 = 0.1 L$

Molarity $= \frac{0.125}{0.1} = 1.25 m o l L = 1.25 m o l {d m}^{3}$

Hence, option D is correct.

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