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Weak Acids

Weak Acids. Question. Is it possible for a strong acid solution and a weak acid solution to have the same pH?. Weak Acids are in Equilibrium. HX( aq )  H + + X - K a = [H + ][X - ] [HX] K a – acid-dissociation constant. Example.

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Weak Acids

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  1. Weak Acids

  2. Question • Is it possible for a strong acid solution and a weak acid solution to have the same pH?

  3. Weak Acids are in Equilibrium HX(aq)  H+ + X- Ka = [H+][X-] [HX] Ka – acid-dissociation constant

  4. Example • A student prepared a .10M solution of formic acid (HCHO2) and measured its pH to be 2.38. A) calculate the Ka B) What is the % of the acid dissociated?

  5. Example • Calculate the pH of a .20M solution of HCN whose Ka = 4.9 x 10-10

  6. Example • Calculate the % HF ionized in a .10M HF solution. Ka = 6.8 x 10-4

  7. Polyprotic Acid • Acids capable of furnishing more than one proton H2SO4 H+ + HSO4- Ka1 = 1.7x10-2 HSO4-  H+ + SO42- Ka2 = 6.4x10-8 • If difference in Ka1 and Ka2 is > 103 only need to consider Ka1

  8. Example • A solution of .0037M H2CO3 dissociates in water. What is the approximate pH of the solution?

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