Titration problem 1

1.837 g of impure potassium hydrogencarbonate was dissolved in water and made up to 100 cm³ in a volumetric flask. 10.0 cm³ of this solution was then titrated with 0.100 M hydrochloric acid using methyl orange indicator. The titres were 17.40, 17.10 and 17.20 cm³. What is the percentage purity of the original sample? Evaluate the accuracy and reliability of this experiment (this means error analysis - if you haven't seen this section yet, check it out first)

The equation for the reaction is:

KHCO₃(aq) + HCl(aq) ⇒ KCl(aq) + H₂O(l) + CO₂(g)

Answer