TYPE 1 (weak ACID)( only a weak ACID put in solution )For a weak acid (HA) in water:HA + H2O⇌H++ A- Ka=[H+][A±][HA]and let CHAbe the analytical concentration (label) of the weak acidOur Equilibrium "ICE" Table[HA][H+][A-]initialCHA00change– x+ x+ xequilibriumCHA- xxxKa=x2CHA±x()Equation 1.1KaCHA±Ka(x)=x20=x2+Ka(x)±KaCHA[H+]=[A±]=x=±Ka+Ka2+4KaCHA2This equation is the exactsolution 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.