What happens when some alkali is added to a buffer solution?

The dissociation of the weak acid ‘HA’ would be shown as:HA (aq) ⇌ H+ (aq) + A (aq)Adding alkali will add OH- ions to the solution. These will react with the H+ ions present in the solution, producing water (H2O). As a result, the concentration of Hions will decrease. The system will react to oppose this change, so the position of equilibrium will move towards the side with the H+. Therefore, the position of equilibrium will move to the right (product side). In order to replace the lost H+ ions, some HA molecules will dissociate forming A- ions in the process. This means the fall in H+ concentration is resisted and the pH of the buffer solution remains fairly constant.

Answered by Holly D. Chemistry tutor

11733 Views

See similar Chemistry A Level tutors

Related Chemistry A Level answers

All answers ▸

Explain why Scandium is not considered a true transition metal.


When vaporised, isotopes of an element can be separated in a mass spectrometer. Name the three processes that occur in a mass spectrometer before the vaporised isotopes can be detected. State how each process is achieved. (6 marks)


What is optical isomerism and how can you distinguish between optical isomers?


(See word doc for complete info) An experiment is carried out whereby the decomposition of hydrogen iodide is observed. Given the equilibrium compositions of each species, calculate the initial mass of hydrogen iodide.


We're here to help

contact us iconContact usWhatsapp logoMessage us on Whatsapptelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo
Cookie Preferences