How to determine Acidic and Alkaline Buffer Solutions - Ionic Equilibria

In this video we want to discuss Buffer Solutions. 1. Definiton of a Buffer Solution We know that a buffer solution is one that maintains pH when small amounts of H+ or OH- is added to it. This means that inside this buffer, the following components must be present: - an acid to remove OH- - a base to remove H+ This mixture of acid and base must be of a conjugate acid-base pair, otherwise the acid and base will neutralise each other in the same solution. 2. Acidic Buffer An acidic buffer is a mixture of weak acid and salt of conjugate base. An example is a mixture of CH3COOH and CH3COONa. For this mixture of conjugate acid-base pair: - CH3COOH is the acid that removes OH- - CH3COO- is the base that removes H+ We can show how H+ and OH- is removed via neutralisation reactions: Since H+ and OH- is removed, therefore pH is maintained. 3. Alkaline Buffer An alkaline buffer is a mixture of weak base and salt of conjugate acid. An example is a mixture of NH3 and NH4Cl. For this mixture of conjugate acid-base pair: - NH4+ is the acid that removes OH- - NH3 is the base that removes H+ We can show how H+ and OH- is removed via neutralisation reactions: Since H+ and OH- is removed, therefore pH is maintained. For the detailed step-by-step discussion on how an acidic and alkaline buffer work, check out this video! Topic: Ionic Equilibria, Physical Chemistry, A Level Chemistry, Singapore Found this video useful? Please LIKE this video and SHARE it with your friends! SUBSCRIBE to my YouTube Channel for new A Level Chemistry video lessons every week at https://www.youtube.com/ChemistryGuru Any feedback, comments or questions to clarify? Suggestions for new video lessons? Drop them in the COMMENTS Section, I would love to hear from you! Learn A Level Chemistry anytime, anywhere with ChemGuru Online! Check out my website for more info on my online video lesson packages at https://chemistryguru.com.sg/a-level-chemistry-tuition-online -~-~~-~~~-~~-~- Please watch my latest video: "2019 P1 Q2 - Deflection of Charged Particle in Electric Field" https://www.youtube.com/watch?v=0kxRm_3sdC4 -~-~~-~~~-~~-~-