Question

A sample of naoh weighing 0.38gram is dissolved in water and solution 2 is made 500 ml in a volumetric flask. Calculate the molarity of the resulting solution.( molar mass of naoh is 40 grampermole)

Answer 1

no. of moles=given mass / molar mass

NaOH= 23+16+1=40g

given mass=0.38g

moles=0.38/40=9.5×10^-3

molarity=no. of moles/ volume in lit.

50ml

molarity = 9.5×10^-3×10^3/50=1.9×10^-1

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