CE3171-302 - LabReport3NAradillas

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Texas Tech University *

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3171

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Civil Engineering

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Apr 3, 2024

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pdf

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Lab Report #2: Page 1 of 8 TEXAS TECH UNIVERSITY DEPARTMENT OF CIVIL, ENVIRONMENTAL AND CONSTRUCTION ENGINEERING Lab Report #3: Alkalinity and Potentiometric Titration CE 3171 – Environmental Engineering Lab Section: 302 Team Number: 4 Instructor: Dr. Chongzheng Na Authors: Nohemi Aradillas Ryan Donnelly Mitchell Lester Victor Martinez Jack Millen Christian Teddy Date of Experiment: 09/29/23 Date of Submission: 10/06/23

Lab Report #2: Page 2 of 8 TABLE OF CONTENT Introduction ................................................................................................................................................... 3 Objectives ..................................................................................................................................................... 3 Materials/Methods ........................................................................................................................................ 3 Results/Calculations ...................................................................................................................................... 5 Discussion ..................................................................................................................................................... 8 LIST OF FIGURES Figure 1: Titration Set Up ............................................................................................................................. 5 Figure 2: Lake Water - Volume of Acid V. pH ............................................................................................ 6 Figure 3: Tap Water - Volume of Acid V. pH .............................................................................................. 6 LIST OF TABLES Table 1: Volume ........................................................................................................................................... 5 Table 2: Titration of Lake and Tap Water .................................................................................................... 5 TEAM MEMBER CONTRIBUTION STATEMENT: Ryan Donnelly wrote the Introduction and Objective. Nohemi Aradillas wrote the materials/methods and results/calculations section. wrote the Results/calculations. Christian Teddy & Victor Martinez wrote Discussion. All members discussed the results and contributed to the lab experiment.

Lab Report #2: Page 3 of 8 Introduction One of the keys in water treatment is the prevention and identification of water softening; it is the manipulation of water alkalinity to prevent such formation from happening. Developing precipitants such as magnesium and calcium can prove harmful to humans and pipes if they develop in drinking water. Even though pH manipulation is common in water treatment, alkalinity has little to do with actual water and wastewater treatment. However, identifying water's ability to form these precipitants is important for preventing formation in the water purification process. Objectives For this experiment, the lab aims to teach the basics of determining alkalinity by using potentiometric titration, slowly adding an acid to a sample to see how the water reacts with such an addition. Using the information gained from the experiment, a graph of how carbonate, bicarbonate, and free hydroxide react with the water can determine the alkalinity of separate water samples. Materials/Methods For the experiment to commence, it is necessary to have access to two water samples, a Burette that contains 0.02 N sulfuric acid ( 𝐻 2 𝑆? 4 ), a 100-mL graduated cylinder, an Erlenmeyer flask, two beakers, a magnetic stirrer equipped with a glass stirring rod, a pH meter and pH probe, and pH standards (pH 4/7/10). Keep in mind that 𝐻 2 𝑆? 4 is a potent acid, and the MSDS folder contains essential information for emergency responses to this chemical. Furthermore, a DI water squeeze bottle is mandatory for the experiment. Every group is at liberty to select two water samples for this experiment. To begin, take 50 mL of the water sample and transfer it to a clean graduated cylinder. Afterward, pour it into an Erlenmeyer flask named after R. A. C. Emil

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