Question

A 2.5 g sample of citric acid (below) is dissolved in water to give a 100 ml solution. Calculate the volume of 250 mM NaOH solution that would have to be added to neutralise 25 ml of the citric acid solution. 

Answer 1

Molarity of citric acid is calculated using the following formula

$Molarity=\dfrac{moles}{volume}$

Number of moles of citric acid is given by;

$Moles=\dfrac{2.5}{192.124}$

$=0.013moles$

$Molarity=\dfrac{0.013}{100}=0.00013$