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Chemistry Core/AP

Chapter 4: 6-8

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WebLecture: Chemical Analysis: Measuring Concentrations

Kotz and Triechel, Chemistry and Chemical Reactivity Chapter 4: 6-8.

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 emited 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.

Videos for Chapter 4: Chemical Equations

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



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