A sample of NaOH weighing 0.38g is dissolved in water and the solution is made to 50.0 mL in a volumetric flask. What is the molarity of the resulting solution?

Solution

Molar space mass space of space NaOH space equals space 40 straight g space mol to the power of negative 1 end exponent Number space of space moles space of space NaOH space equals space fraction numerator 0.38 over denominator straight H end fraction Molarity space equals fraction numerator Moles space of space solute over denominator Litres space of space solution end fraction space equals space fraction numerator 0.38 divided by 40 over denominator 50 divided by 1000 end fraction space space space space space space space space space space space space equals fraction numerator 0.38 over denominator 40 end fraction cross times 1000 over 50 equals space 0.19 space straight M

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