<p> Finding the pH of Weak Acids</p><p>1) Find the pH of a 0.065 M solution of formic acid. The acid dissociation -4 constant (Ka) for formic acid is 1.8 x 10 .</p><p>-5 2) Find the pH of a 0.325 M acetic acid solution. Ka = 1.8 x 10 .</p><p>3) Find the pH of a solution that contains 0.0034 M lactic acid (Ka = -4 -5 1.4 x 10 ) and 0.056 M propionic acid (Ka = 1.4 x 10 ).</p><p>4) What is the pH of a 0.00056 M butyric acid solution. pKa = 4.82.</p><p>Methyl orange is a commonly used indicator dye that changes color in acidic conditions from red (at pH 3.1) to orange-yellow (at pH 4.4).</p><p>For chemistry help, visit www.chemfiesta.com © 2002 Cavalcade Publishing – All Rights Reserved 1. Dissolve 0.5g of methyl orange in 1 liter of distilled water</p><p>For chemistry help, visit www.chemfiesta.com © 2002 Cavalcade Publishing – All Rights Reserved</p>