A sample of pyridine is titrated at with nitric acid

CHEMISTRY · Multi-part · A Level · Chemistry · Acids and bases · Acids and bases

Problem

50.0\,\text{mL}

sample of

0.100\,\text{M}

pyridine

(C_5H_5N,\; K_b = 1.7\times10^{-9})

is titrated at

25^\circ\text{C}

with

0.100\,\text{M}

nitric acid. Assume ideal behavior and constant total volume equal to the initial

50.0\,\text{mL}

plus the volume of acid added. (a) Calculate the pH of the solution after

10.0\,\text{mL}

of the nitric acid have been added. (b) Calculate the pH after a total of

25.0\,\text{mL}

of the acid have been added. (c) Calculate the pH at the equivalence point of the titration (after

50.0\,\text{mL}

of acid have been delivered). (d) On appropriately labeled axes, sketch the overall titration curve (pH versus volume of acid added). Clearly indicate the buffer region and comment on how the calculated pH values support your sketch.

Related theory

Equilibrium
Acid-Base Titrations

Browse the problem library