PRA028 - that each acid will donate to the solution separately then add them together The lactic acid will cause the H concentration to be 6.90 x

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Finding the pH of Weak Acids 1) Find the pH of a 0.065 M solution of formic acid. The acid dissociation constant (K a ) for formic acid is 1.8 x 10 -4 . 2) Find the pH of a 0.325 M acetic acid solution. K a = 1.8 x 10 -5 . 3) Find the pH of a solution that contains 0.0034 M lactic acid (K a = 1.4 x 10 -4 ) and 0.056 M propionic acid (K a = 1.4 x 10 -5 ). 4) What is the pH of a 0.00056 M butyric acid solution. pK a = 4.82. For chemistry help, visit www.chemfiesta.com © 2002 Cavalcade Publishing – All Rights Reserved
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Finding the pH of Weak Acids - Answers 1) Find the pH of a 0.065 M solution of formic acid. The acid dissociation constant (K a ) for formic acid is 1.8 x 10 -4 . 2.47 2) Find the pH of a 0.325 M acetic acid solution. K a = 1.8 x 10 -5 . 2.62 3) Find the pH of a solution that contains 0.0034 M lactic acid (K a = 1.4 x 10 -4 ) and 0.056 M propionic acid (K a = 1.4 x 10 -5 ). To solve, find the amount of H
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Unformatted text preview: + that each acid will donate to the solution separately, then add them together. The lactic acid will cause the H + concentration to be 6.90 x 10-4 M and the propionic acid will cause the H + concentration to be 8.85 x 10-4 M. When you add these together, you find the total H + concentration in the solution is 1.58 x 10-3 M. To find the pH, take the negative log of this number to get a pH of 2.80. 4) What is the pH of a 0.00056 M butyric acid solution. pK a = 4.82. pK a = -log[K a ]. Using this equation, the K a of butyric acid is found to be 1.51 x 10-5 . When you solve this problem in the same way you solved the ones above, you find the pH of this solution is 4.04. For chemistry help, visit www.chemfiesta.com © 2002 Cavalcade Publishing – All Rights Reserved...
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This note was uploaded on 11/13/2010 for the course CHEM 11578 taught by Professor Juliakovacs during the Fall '09 term at University of Washington.

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PRA028 - that each acid will donate to the solution separately then add them together The lactic acid will cause the H concentration to be 6.90 x

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