Chemistry
Chapter 4: 6-8
Homework
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 | [H3O+]: Concentration of hydronium ion (molarity) | |
|---|---|---|
| Concentration from pH | ||
| Beer-Lambert law |
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 #1 GUIDED INQUIRY -- Phase I-II
Working with your teacher and teammates, design a lab to observe and classify several processes as physical change, chemical change, and ambiguous change based on macroscopic observations using flame tests and qualitative analysis techniques to detect the presence of specific chemicals in known samples, then apply these techniques to identify the anions and cations present in an unknown sample.
Carry out your experimental plan and post your data to the website for evaluation and discussion.
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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