CH302 Chapter 7 notes part 2 answers

CH302 Chapter 7 notes part 2 answers - Finding pH for a...

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1 Finding pH for a Weak Monoprotic Acid Calculate the concentrations of the various species in 0.15 M acetic acid, CH 3 COOH, solution. [] [ ] 5 3 - 3 3 a - 3 3 2 3 10 8 . 1 COOH CH COO CH O H K COO CH O H O H COOH CH + + × = = ←+ + xM xM -x)M . ( xM xM xM M + + + + + + 15 0 [] m Equilibriu - Change 0.15 [] Initial COO CH O H O H COOH CH - 3 3 2 3 Substitute the quantities into the K a expression: [ ][ ] () 5 3 3 3 a 10 8 . 1 15 . 0 COOH CH COO CH O H K + × = = = x x x Finding pH for a Weak Monoprotic Acid 5 2 5 2 10 8 . 1 15 . 0 10 8 . 1 15 . 0 × × = x x x x Simplification of Calculations : 5 2 3 a 5 2 5 2 10 8 . 1 15 . 0 []. to compared ignore enough to small is . assumption the make then 10 K If 10 8 . 1 15 . 0 10 8 . 1 15 . 0 × × × = x x x x x x Ionization Constants for Weak Monoprotic Acids [ ] M M M x x 15 . 0 10 6 . 1 15 . 0 COOH CH COO CH O H 10 6 . 1 10 7 . 2 3 3 3 3 3 6 2 × = = = × = × + ( )( ) 0 10 7 . 2 10 8 . 1 10 8 . 1 15 . 0 6 5 2 5 = × × + × = x x X x x ( ) ( ) 3 - 3 6 2 5 5 10 1.6 - and 10 6 . 1 1 2 10 7 . 2 1 4 10 8 . 1 10 8 . 1 × × = × × ± ×
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CH302 Chapter 7 notes part 2 answers - Finding pH for a...

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