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Exam (elaborations) BIOCHEMISTRY Organic Chemistry

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This resource offers a targeted collection of quizzes, tests, and practice problems designed to strengthen your understanding of core chemistry topics. It covers essential areas such as analytical chemistry, thermodynamics, protein chemistry, enzyme mechanisms, membrane chemistry, and bioenergetics. Each set is carefully structured to test conceptual knowledge, problem-solving skills, and application of chemical principles at a university level. Ideal for students preparing for exams, coursework, or professional studies, these materials provide thorough practice and revision opportunities, helping you build confidence and achieve higher academic performance.

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ACID AND BASE EQUILIBRIA

1. Identify which species is /are Bronsted-Lowry acids and bases in the following reactions

a. NH4+ + HSO3- ⇌ NH3 + H2SO4
b. NH2- + H2O ⇌ NH3 + OH-


2. a. Calculate the percent ionization of a 0.20 M solution of the monoprotic acetylsalicylic acid (aspirin)
for which
Ka = 3.0 x 104-.
b. The pH of gastric juice in the stomach is 1.00. After swallowing 0.20 M of acetylsalicylic acid,
calculate the percent ionization of the aspirin in the stomach under these conditions.

3. Determine whether aqueous solutions of each of these salts are acidic, basic, or neutral:
a. Ba(CH3COO)2, b. NH4Cl, c. CH3NH3Br, d. KNO3, e. Al(ClO4)3.

4. If 10 mL of 0.6 M HClO solutions is titrated with 0.3 M KOH solution, calculate the pH of solution
when the volume of KOH added is as provided below. Take Ka of HClO to be 2.9 x 10-8.
a) 0 mL
b. 4 mL
c. 9 mL
d. 12 mL
e. 22.5 mL
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John McMurry Organic Chemistry
Publisher: 2006 ISBN: 9780495110675 Edition: Unknown

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