University College - Chemistry Chem 112A Study Guide - Spring 2018, Comprehensive Midterm Notes - Nevus, Solvent, Ph

• School: WUSTL
• Department: University College - Chemistry
• Course: University College - Chemistry Chem 112A
• Professor: Bleeke John

Document Summary

+ + oh: strong acid complete dissociation. [h+] is equal to original [ha: strong base complete dissociation. Bases derived from group ii metals will have the formula m(oh)2 and will yield two hydroxides: weak acid when only weak acid is initially present. Solved by examining the equilibrium of acid ionization. The ka of hocl is 3. 5 x 10-8. Set up a rea(cid:272)tion ta(cid:271)le for the following ionization: hocl h+ + ocl- initial change final. Solve by using the equilibrium expression: (cid:1853) = + [(cid:1841) ] The assumption is made that x << than 0. 1 m due to the small ka. Solving for x: x = 5. 92 x 10-5 m and the ph is 4. 23. +x x: weak base when only weak base is initially present. Solved by examining the equilibrium of base ionization. What is the ph of a 1. 0 m methylamine solution. The kb of ch3nh2 is 4. 38 x 10-4.