580340 Determination of Water Hardness by Titration Q

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South Plains College *

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1406

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Chemistry

Date

Dec 6, 2023

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6

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Determination of Water Hardness by Titration Jerret Jarvis November 2, 2023
1 Data Activity 1 Data Table 1: Complexometric Titration of Hard Water Hard Water Trial 1 Hard Water Trial 2 Hard Water Trial 3 Initial Syringe Reading (mL) 1.0 mL 1.0 mL 1.0 mL Final Syringe Reading (mL) 0.6 mL 0.5 mL 0.2 mL Volume of EDTA Consumed (mL) 0.4 mL 0.5 mL 0.8 mL Water Hardness ppm CaCO 3 (mg/L) 400.4 ppm 500.5 ppm 800.9 ppm Average ppm CaCO 3 (mg/L): 567.23 ppm © 2016 Carolina Biological Supply Company
2 Data Table 2: Complexometric Titration of Tap Water Hard Water Trial 1 Hard Water Trial 2 Hard Water Trial 3 Initial Syringe Reading (mL) 1.0 mL 1.0 mL 1.0 mL Final Syringe Reading (mL) 0.3 mL 0.5 mL 0.3 mL Volume of EDTA Consumed (mL) 0.7 mL 0.5 mL 0.7 mL Water Hardness ppm CaCO 3 (mg/L) 700.7 ppm 500.5 ppm 700.7 ppm Average ppm CaCO 3 (mg/L): 633.97 ppm © 2016 Carolina Biological Supply Company
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3 Activity 2 Data Table 3: Complexometric Titration of Soft Water Hard Water Trial 1 Hard Water Trial 2 Hard Water Trial 3 Initial Syringe Reading (mL) 1.0 mL 1.0 mL 1.0 mL Final Syringe Reading (mL) 0.7 mL 0.9 mL 0.7 mL Volume of EDTA Consumed (mL) 0.3 mL 0.1 mL 0.3 mL Water Hardness ppm CaCO 3 (mg/L) 300.3 ppm 100.1 ppm 300.3 ppm Average ppm CaCO 3 (mg/L): 233.57 ppm 1. The calmagite indicator changes from a pink to a blue color during the titration. Describe why the color change occurs. It shows a chemical reaction occurred. 2. Based on the results of your experiment, do you have hard or soft water? Briefly explain your answer. I have Hard water. The flask color turned pink and not purple. 3. EDTA is added to some soaps and cleaning products to improve their performance. Based on the results of your experiment, explain why it would be beneficial. The EDTA attracts the metal particles out of the hard water making the water soft. It would be better for your skin. © 2016 Carolina Biological Supply Company
4 4. How could this experiment be modified to determine temporary or permanent hardness of water? Could use filtration and boiling methods to find temporary hardness. 5. A complexometric titration can also be used to determine the amount of calcium in milk. The calcium concentration in milk is typically 1,200 mg/L. How would you alter the procedure used in this experiment to determine milk’s calcium content? Photos Photo 1 Photo 2 © 2016 Carolina Biological Supply Company
5 Photo 3 © 2016 Carolina Biological Supply Company
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