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

13089 Views

See similar Chemistry A Level tutors

Related Chemistry A Level answers

All answers ▸

Explain why silicon dioxide has a higher melting point than sulphur trioxide


What is solvent leveling? How can we distinguish between two strongly acidic solutions? (This is a challenging question and is included for interest only)


Why does ice float on water?


A solution of ethanoic acid is made by dissolving 3g of pure liquid propanoic acid in 500cm^3 water. Given the pH of the solution is 2.98, calculate Ka.


We're here to help

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

© MyTutorWeb Ltd 2013–2025

Terms & Conditions|Privacy Policy
Cookie Preferences