CHEM102 Lecture Notes - Lecture 12: Conjugate Acid, Weak Base, Ion

• School: University of Alberta
• Department: Chemistry
• Course: CHEM102
• Professor: Sai Yiu

Document Summary

Anions derived from strong acids do not react with water and shows no effect on the ph. Cl- (aq) + h2o (l) (cid:1) hcl (aq) + oh- (aq) does not take place. If the anion is from weak acid (remember: anion is a strong conjugate base) the following reaction takes place in water: Ch3coo- (aq) + h2o (l) (cid:1) ch3cooh (aq) + oh- (aq) Remember: *all salts dissociate completely in water to form ions. Whether the salt is acidic, basic or neutral depends on the source of its ions. Basic strong acid (weak conjugate base) strong base (weak conjugate acid) For example: na+ cl- strong acid (weak conjugate base) weak base (strong conjugate acid) + cl- weak acid (strong conjugate base) strong base (weak conjugate acid) For example: na+ f- weak acid + weak base. 3- (aq) + h3o+ (aq) ka3 = 4. 2 x 10-13. + (aq) + h2o (l) (cid:1) nh3 (aq) + h3o+ (aq)