Understanding Acid-Base Equilibria in General Chemistry
Explore Module 13 on acid-base equilibria in General Chemistry (Chem2331) covering pH scales, concentration calculations, solutions ranking, and pH of salts with approximate ranges. Dive into videos, formulas, and fast approximations for deeper comprehension.
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Module 13: Acid-Base equilibria General Chemistry Chem2331
Module 13 Module 13 Session 5 1. Video 1: The logarithmic scale pH 1. Rewriting formulas using the logarithmic scale 2. Video 2: Fast approximations of pH of solutions. 1. Rank solutions in increasing pH 3. Video 3: find pH of salts Chem 2331: General Chemistry 2
The logarithmic scale Stop working with so many exponents! The pH H2O(l) + H2O(l) H3O+(aq) + OH-(aq) [H3O+][OH-] = 1.0 x 10-14 Kw = in a neutral solution [H3O+] = [OH-] = 10-7 M pH = -log [H3O+] pOH = -log [OH-] pOH + pH = 14 Chem 2331: General Chemistry 3
The logarithmic scale The relations among [H3O+], pH, [OH-], and pOH. Chem 2331: General Chemistry 4
The logarithmic scale A solution has a pH = 3.5. What is the concentration of OH- and H3O+? A 1.0M solution of an unknown acid has a pH = 3.5. What is the pKa of the acid
Fast approximations of pH of solutions Rank the below solutions in decreasing pH a) 0.1M NaOH b) 0.5M HClO3 c) 1M HClO d) 0.1M NaClO3 e) 0.1M Na3PO4 Repeat ranking them in decreasing pOH
Fast approximations of pH of solutions Complete the table Acid/Base [H+]: > or < 1E-7 pH: > or < 7 [OH-] > or < 1E-7 pOH > or < 7 0 <pKa < 14? 0 < pKb < 14? Strong Acid (ex: HCl) Strong Base (ex: NaOH) Weak Acid (ex CH3COOH) Weak Base (ex NH3) Neutral compound (ex NaCl) Chem 2331: General Chemistry 7
pH of salts Give and approximate range for the pH of the following salts when dissolved in water. Possible ranges: 1) pH < 2 2) 2 < pH < 7 3) pH = 7 4) 7< pH < 12 5) pH > 12 Salts a) 1M Mg(OH)2 b) 1M MgSO4 c) 1M NaNO2 d) 1M NH4Cl e) 1M NaHSO4
