CHEM 104/ CHEM104 General Chemistry II Module 2 Exam (Latest 2026/2027 Update) | Complete Exam Questions with Verified Answers and Detailed Rationales | Portage Learning

INSTANT PDF DOWNLOAD – This comprehensive study guide covers the Module 2 Exam for CHEM 104 General Chemistry II at Portage Learning (Latest 2026/2027 Update), featuring verified practice questions with correct answers and detailed rationales. Based on typical general chemistry curricula, this resource covers acid-base chemistry (identifying acids/bases/salts, Brønsted-Lowry theory, weak acids), equilibrium reactions and Le Chatelier’s principle, buffer solutions and the Henderson-Hasselbalch equation, titration calculations, and solubility product constants (Ksp). Includes practice problems with step-by-step solutions. Key Topics & Practice Q&A Question 1: Identify each of the compounds below as ACID, BASE or SALT on the basis of their formula and explain your answer. (1) Cr(OH)₃ (2) HAsO₄ (3) CoCO₃ Answer: (1) BASE – contains Cr metal + OH polyatomic group; (2) ACID – contains H + polyatomic group (AsO₄); (3) SALT – contains Co metal + polyatomic group (CO₃). Question 2: For the Brønsted-Lowry acid-base reaction shown below, list the stronger acid, stronger base, weaker acid, and weaker base: NH₄⁺ + H₂PO₄⁻ ⇌ NH₃ + H₃PO₄ Answer: Stronger acid: H₃PO₄ ; Stronger base: NH₃ ; Weaker acid: NH₄⁺ ; Weaker base: H₂PO₄⁻. Question 3: Show the calculation of the [H⁺], pH, and % ionization for 0.645 M acetic acid (HC₂H₃O₂). Ka = 1.8 × 10⁻⁵ Answer: H⁺ = x = 3.41 × 10⁻³ M ; pH = -log(3.41×10⁻³) = 2.47 ; % ionization = (3.41×10⁻³ / 0.645) × 100 = 0.53%. Question 4: Show the calculation of the pH of a buffer prepared by mixing 0.100 M NH₄Cl and 0.0750 M NH₃. Ka = 1.8 × 10⁻⁵ Answer: pKa = -log(1.8×10⁻⁵) = 4.74. pH = pKa + log([base]/[acid]) = 4.74 + log(0.0750/0.100) = 4.74 + (-0.125) = 4.62. Question 5: Show the calculation of the molar solubility (mol/L) of BaF₂, Ksp of BaF₂ = 1.0 × 10⁻⁶. Answer: Ksp = [Ba²⁺][F⁻]² = (s)(2s)² = 4s³. s = (1.0×10⁻⁶ / 4)^(1/3) = 6.3 × 10⁻³ mol/L. Question 6: Predict whether a solution of LiF is acidic, basic, or neutral. Answer: Basic. F⁻ hydrolyzes to form a weak acid (HF) and OH⁻, resulting in a basic solution. CHEM 104 Exam 2 Study Materials Portage Acid Base Salt Identification Bronsted Lowry pH Calculation Weak Acid Ka Percent Ionization Acetic Acid Henderson Hasselbalch Buffer pH Ksp Molar Solubility Calculation General Chemistry II Module 2 Le Chatelier Equilibrium Shift Titration Equivalence Point Portage Learning CHEM 104 2026 A+ Grade Chemistry Study Guide