Lecture 09: Graphical Solutions (Chapter 2)

LECTURE OVERVIEW:
In this lecture, we explore graphical methods for solving acid-base speciation problems, focusing on constructing and interpreting pC-pH diagrams. We begin by outlining how these diagrams can be used to calculate the pH of a solution and understand the concentrations of species at different pH levels. The lecture covers the construction of pC-pH diagrams for monoprotic acids and expands this method to polyprotic acids, demonstrating how to graphically solve for the pH and evaluate species concentrations in more complex systems.

INTENDED LEARNING OUTCOMES:
By the end of the lecture, you will be able to:
• Construct pC-pH diagram
• Solve for the solution pH using the pC-pH diagram
• Expand the constructed diagram for polyprotic acids

RELEVANT READINGS:
• Water Chemistry, 2nd Edition, by Mark M. Benjamin
6. Acids and Bases, Part 2
6.1. Graphical Solutions for Sets of Simultaneous Equations
6.2. Using LogC-pH Diagrams to Solve Weak Acid/Base Problems

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COURSE INFORMATION:
This video is part of the Environmental Chemistry course, designed and taught by Prof. Mim Rahimi. The course covers the following chapters: (1) Fundamentals of Environmental Chemistry, (2) Acids and Bases and Related Phenomena, (3) Chemistry of Metals, and (4) Redox Chemistry in Environmental Systems.

COURSE REFERENCES:
The recommended textbooks for the course are:
• Main Reference: Water Chemistry, 2nd Edition, by Mark M. Benjamin, Waveland Press Inc., ISBN: 978-1478623083
• Additional Useful Reference: Environmental Chemistry, 10th Edition, by Stanley E. Manahan, CRC Press, ISBN: 978-1032339726