Question

A sample of NaOH weighing 0.38 g is dissolved in H2O and solution is made to 50.0ml in volumetric flask. what is molarity of the resulting solution
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Answer 1

molarity = no. of moles in 1 litre solution

no. of moles = weight of NaOH / molecular mass of NaOH

= 0.38/40= 0.19/20 no. of moles in 50ml solution

no. of moles in 1 l solution = no. of moles in 50ml * 20

=0.19M