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11_LectureWeb

# 11_LectureWeb - HA D(a What is K b for the hydrolysis of...

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Announcements First Exam-Wednesday, February 13, 7:15-8:35 PM Section Room 1,2,3,4,5,6,7,8 E100 Vet Med 9,10,11,12,13,14,15,16 138 CEM 17,18,19,20 B106 Wells Hall 21,22,23,24,25,26,27,28,29,30 1281 Anthony Hall Extended Office Hours Wednesday Afternoon: 2–3:30 PM Learning Objectives 2/12/08 You should: 1. know how to find the relationship between K neut for neutralization of a weak acid by a strong base or neutralization of a weak base by a strong acid, K a , and K b . 2. be able to calculate the pH of a buffer solution following addition of a strong acid or base. 2 Problem: Relationship between K a , K b , and K neut If K a for the ionization of a weak acid HA is given by K a = @ H 3 O + [email protected] A - D ÅÅÅÅÅÅÅÅÅÅÅÅÅÅÅÅ
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Unformatted text preview: @ HA D (a) What is K b for the hydrolysis of the conjugate base A-? (b) What is K neut for the neutralization of the acid using OH-? (c) How are K a , K b , and K neut related? 3 Problem: Buffer Solution (a) What is the pH of pure water at 25 °C? (b) What would the pH be if 0.10 mL of 12 M HCl was added to 100 mL of pure water at 25 °C? (c) What is the pH of 100 mL of NH 3 /NH 4 + buffer solution at 25 °C if [NH 3 ] = [NH 4 + ] = 0.20 M? K b (NH 3 ) = 1.8 ä 10-5 . (d) What would the pH be if 0.10 mL of 12 M HCl was added to this buffer solution at 25 °C? 4...
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