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Podcast 18.3

Podcast 18.3. K w , pH, pOH, pK a , pK b. Ion Product Constant for Water (K w ). Occasionally, in water, a H + is transferred between H 2 O molecules. Simple K w Problems. The [OH - ] of a solution is 1.0 x 10 - 3 M. What is the [H 3 O + ]?

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Podcast 18.3

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  1. Podcast 18.3 Kw, pH, pOH, pKa, pKb

  2. Ion Product Constant for Water (Kw) Occasionally, in water, a H+ is transferred between H2O molecules

  3. Simple Kw Problems • The [OH- ] of a solution is 1.0 x 10- 3M. What is the [H3O+]? • The [H3O+] of a solution is 4.76 x 10-11. What is the [OH-]?

  4. pH and pOH Indicates the “acidity” of the solution pH = _____________________ From the French pouvoir hydrogene pOH = ______________________ [H+][OH-] = Kw = 1 x 10-14 pH + pOH = _____ = ______

  5. PH Scale 0 1 2 3 4 5 6 7 8 910 11 12 13 14 Neutral [H+]>[OH-][H+] = [OH-][OH-]>[H+] Acidic Basic

  6. pH Problems • Calculate the pH of a 0.50 M solution of HClO4. • Calculate the pH of a 0.50 M solution of hydrocyanic acid. Ka = 6.2 x 10-10.

  7. What is the Ka of a weak acid if a 0.33 M solution has an [OH-] of 2.5 x 10-9 M? • Weak acid [HA]o = 0.75 M. The solution has a pH = 5.3. Find the Ka for the weak acid.

  8. pKa, pKb, pKw

  9. Ammonia has a pKb = 4.74. What is the concentration of an ammonia solution with a pH of 9.75?

  10. Try One Yourself! • A 0.40 M solution of lactic acid (HC3H5O3) has a pH of 2.12 What is the pKa of lactic acid?

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