pH and Titration Analysis

Chapter 4: 6-8 Homework

Reading Preparation
WebLecture
Study Activity
Preparation work for chat
Online Quiz
Lab Instructions

Reading Preparation

Textbook assignment: Read Kotz and Triechel, Chemistry and Chemical Reactivity Chapter 4: Sections 6 to 8.

Study Notes

4.6 pH. If you don't remember how to use logarithms and exponents, review Appendix A, section 1 of the text. The pH notation is simply a shorthand way to write the exponent of the concentration of the the H⁺ molecule in a solution.

4.7 Reactions in Aqueous Solution. Are there any serious differences between determining masses from moles or moles from masses for aqueous solutions and for non-aqueous solutions? Be sure that you understand the point of doing titrations, and the functions of indicators in determining a solution concentration.

4.8 Spectrophotometry. Light is the energy emitted by electrons as they jump between orbitals or energy levels within an atom or molecule. Light absorption, then, is a measure of the number of electrons available to grab light as it passes through a solution, so we can use absorption, color, and path length (penetration into a solution) to measure the concentration of a solution precisely.

pH from Concentration	$pH = \log [H_{3} O^{+}]$	[H₃O⁺]: Concentration of hydronium ion (molarity)
Concentration from pH	$[H_{3} O^{+}] = 10^{- pH}$	[H₃O⁺]: Concentration of hydronium ion (molarity)
Beer-Lambert law	$A = ϵ * l * c$	A: Absorbance ε: molar absorptivity for substance at given temperature and wavelength l: path length c: concentration (molarity)

Web Lecture

Read the following weblecture before chat: Chemical Analysis: Measuring Concentrations

Study Activity

Videos for Chapter 4: Chemical Equations

Review the Videos at Thinkwell Video Lessons under ACIDS and BASES / REACTIONS IN AQUEOUS SOLUTIONS

Arrhenius/Brønsted-Lowry Definitions of Acids and Bases
Hydronium, Hydroxide, and the pH Scale
Acid-Base Titrations

You may also find using this PHET pH Scale interactive experience useful. Try operating it in all three modes.

Chat Preparation Activities

Essay question: The Moodle forum for the session will assign a specific study question for you to prepare for chat. You need to read this question and post your answer before chat starts for this session.
Mastery Exercise: The Moodle Mastery exercise for the chapter will contain sections related to our chat topic. Try to complete these before the chat starts, so that you can ask questions.

Chapter Quiz

Required: Complete the Mastery exercise with a passing score of 85% or better.
Go to the Moodle and take the quiz for this chapter.

LAB #2 GUIDED INQUIRY -- Phase III

Complete and post your formal report.

References:

AP2009 14 Separation and qualitative analysis of cations and anions
APGIE Investigation 9 Physical and Chemical Changes: Can the Individual Components of Quick Ache Relief Be Used to Resolve Consumer Complaints?
IGHCE Lab 19.1-2 Use Flame Tests and Borax Beads to Discriminate Metal Ions
IGHCE Lab 19.3 Qualitative Analysis of Inorganic Anions, Cations, and Bone
(Alternative lab) Flame Tests

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