Question

What is the minimum volume of water in which naoh is dissolved during preparation of 250 cc of n/10 naoh solution?

Answer 1

0.1 M NaOH means to dissolve 0.1 moles NaOH in 1 liter of solution.  Since you don't want to make 1 liter of solution, but want only 250 ml (0.25 liters), then you also don't need 0.1 moles NaOH.  You need only 1/4 of that.  So done by dimensional analysis, it looks like this...

0.1 moles/liter x 0.25 liters = 0.025 moles NaOH needed

The molar mass of NaOH is 23 + 16 + 1 = 40 g/mole

Thus, 0.025 moles NaOH x 40 g/mole = 1 gram NaOH

To make 250 ml of 0.1 M NaOH, you dissolve 1 gram NaOH in enough water to make a final volume of 250 mls.

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