Review for Solving pH Problems: Base Ionization 1)

Review for Solving pH Problems: Acid Ionization : HA + H2O A- + H3O+ CH3 COOH + H2O CH3 COO- + H3O+ base Ionization : B + H2O BH+ + OH- CH3NH2 + H2O CH3NH3+ + OH- 1) Strong Acid complete dissociation [H+] is equal to original [HA] 2) Strong base complete dissociation [OH-] is equal to original [MOH] Where M represents a cation. Bases derived from group II metals will have the formula M(OH)2 and will yield two hydroxides. 3) Weak acid when only weak acid is initially present. Solved by examining the equilibrium of acid Ionization . What is the pH of a solution of M HOCl? The Ka of HOCl is x 10-8. Set up a reaction table for the following Ionization : HOCl H+ + OCl- HOCl H+ OCl- initial 0 0 change -x +x +x final x x x Solve by using the equilibrium expression: = + [ ][ ]= 10 8 [ ][ ] The assumption is made that x << than M due to the small Ka.

5) Salts – A salt is added. A salt is the conjugate base of a weak acid with a cation or a conjugate acid of a weak base with an anion. a) conjugate base and cation What is the pH of a 0.30 M NaF solution?

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  Review, Base, Problem, Solving, Ionization, Review for solving ph problems, Base ionization

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