Review for Solving pH Problems: Base Ionization 1)
Review for Solving pH Problems: Acid Ionization : HA + H2O A- + H3O+ CH3COOH + H2O CH3COO- + 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.
c) strong base to a buffer solution A problem of this type would have a reaction followed by an equilibrium. The reaction would be solved as described in 6 above.
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