CH301 - Type1.acid

CH301 - Type1.acid - TYPE 1 (weak ACID) ( only a weak ACID...

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TYPE 1 (weak ACID) ( only a weak ACID put in solution ) For a weak acid (HA) in water: HA + H 2 O H + + A - K a = [H + ][A ± ] [HA] and let C HA be the analytical concentration (label) of the weak acid Our Equilibrium "ICE" Table [HA] [H + ][ A - ] initial C HA 00 change – x + x + x equilibrium C HA - x x x K a = x 2 C HA ± x () Equation 1.1 K a C HA ± K a ( x ) = x 2 0 = x 2 + K a ( x ) ± K a C HA [H + ] = [A ± ] = x = ± K a + K a 2 + 4 K a C HA 2 This equation is the exact solution for calculating the [H + ] for any solution made by mixing a concentration of ONLY a weak acid in water. (What I have designated a "Type 1" problem) If we are using a REASONABLE concentration for HA ( somewhere between 1.0 M and 0.05 M) AND
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This note was uploaded on 11/02/2008 for the course CH 301 taught by Professor Fakhreddine/lyon during the Fall '07 term at University of Texas.

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