ln11as08 - Lecture 11 Addendum Some Useful Information for...

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Lecture 1 1 Addendum: Some Useful Information for Figuring Out Acid/Base Calculations symbol H + HA BH + B A - OH - type Strong acid Weak acid I Weak acid II (salt of weak base) Weak base I Weak Base II (salt of weak acid) Strong base example HNO3 Acetic acid Ammonium chloride ammonia Sodium acetate Potassium hydroxide K range K a = K a = 10 -2 to 10 -10 K a = 10 -2 to 10 -10 K b = 10 -2 to 10 -10 K b = 10 -2 to 10 -10 K b = equation [H + ] = C H+ [H + ] = (K a C HA ) 1/2 [H + ] = (K a C BH+ ) 1/2 [OH - ] = (K b C B ) 1/2 [OH - ] = (K a C A- ) 1/2 [OH - ] = C OH- pH range 0-2 3-6 3-6 8-11 8-11 12-14 pOH range 12-14 8-11 8-11 3-6 3-6 0-2 Useful thoughts in working acid-base problems: 1. The first thing you do when you work an acid base problem is identify each compound as one of the 6 types of acids or bases: H + , HA, BH + , A - , B, OH - . 2, If the problem involves a single acid or base, work the simple strong or weak acid problem as above. 3. Before you work a problem, estimate the pH of the answer. Note the simple relationship between K and pH.
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