Chemistry
Chemistry
10th Edition
ISBN: 9781305957404
Author: Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher: Cengage Learning
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a-c

Calculations: Part 1: 1. Follow the steps below to calculate the concentration of CaCO3 (in units of ppm or mg/L.) based on your two endpoint measurements. This is the measure of your water hardness. a. Using the molarity and volume of titrant added, determine the moles of titrant added to your solution. Do this for both endpoint measurements. 0.0 051. 0. ol M. O10H L 0-001M.0. 01 04L - 1.04 X10"S MOL EDTA : 1.051X10-4 EPTÁ b. Based on (a) and the chemical equation for the reaction, calculate the moles of calcium carbonate titrated. Do this for both endpoint measurements. Motes mor EDIA. Mel Calco3 |.040x.105 Mol ca ety c. Based on (b), calculate the concentration of calcium carbonate in units of ppm or mg/L. This is a measure of the water hardness of the provided water sample. Do this for both endpoint measurements. 1-os d. Calculate the average water hardness (in units of ppm) based on your two measurements.
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Transcribed Image Text:Calculations: Part 1: 1. Follow the steps below to calculate the concentration of CaCO3 (in units of ppm or mg/L.) based on your two endpoint measurements. This is the measure of your water hardness. a. Using the molarity and volume of titrant added, determine the moles of titrant added to your solution. Do this for both endpoint measurements. 0.0 051. 0. ol M. O10H L 0-001M.0. 01 04L - 1.04 X10"S MOL EDTA : 1.051X10-4 EPTÁ b. Based on (a) and the chemical equation for the reaction, calculate the moles of calcium carbonate titrated. Do this for both endpoint measurements. Motes mor EDIA. Mel Calco3 |.040x.105 Mol ca ety c. Based on (b), calculate the concentration of calcium carbonate in units of ppm or mg/L. This is a measure of the water hardness of the provided water sample. Do this for both endpoint measurements. 1-os d. Calculate the average water hardness (in units of ppm) based on your two measurements.
Data: Part I. Calculation for dilution of 1000 Ppm CaCO, to 200 ppm CaCO: M, V, = Mz Vz Co00r.m)CV) (200) 2o000 J000 V4- 20mL Calculate the volume of titrant (10 mM EDTA) required to reach the endpoint: 9 somte . 200 PPM • olg MM- 100.0ggiml 0.01gy IM6! 100.0agly61 9.99 X1ó 5mol Caco, q.99x105 MOIEDTA 9.99VI6'S M=n V 0.01M 1ONM 103 2 0.0l AM V = . 00999L V-n.99 ML 10 mL EDTA Part 2. Hach-1 test trip results and corresponding water hardness: -- 50ppm Calculate the volume of titrant (1 mM EDTA) required to reach the end point: g soute = S0ppmx50 MMCACO3" 100.09glmol 106 0.0025g x IMo = 2.50 x1osMol 100.09 - 2.50x 10 S MOI EDTA V=n :2.5XIos 0. 001M V = .025 L v= 25 ML EOTA : .001 MED TA ble 1: Titration Data for Parts 1 and 2 Known Solution Known Solution Natural Water Trial 1 Trial 2 Sample nitial Burette Reading (mL) 5.24 mL 15.4 6 mL 3.87 12.니1 mL inal Burette Reading (mL) 15.78 mL 26.19 ml Lo. 40m L 8.54 mu olume Titrant Added (mL) to. 51 ML
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Transcribed Image Text:Data: Part I. Calculation for dilution of 1000 Ppm CaCO, to 200 ppm CaCO: M, V, = Mz Vz Co00r.m)CV) (200) 2o000 J000 V4- 20mL Calculate the volume of titrant (10 mM EDTA) required to reach the endpoint: 9 somte . 200 PPM • olg MM- 100.0ggiml 0.01gy IM6! 100.0agly61 9.99 X1ó 5mol Caco, q.99x105 MOIEDTA 9.99VI6'S M=n V 0.01M 1ONM 103 2 0.0l AM V = . 00999L V-n.99 ML 10 mL EDTA Part 2. Hach-1 test trip results and corresponding water hardness: -- 50ppm Calculate the volume of titrant (1 mM EDTA) required to reach the end point: g soute = S0ppmx50 MMCACO3" 100.09glmol 106 0.0025g x IMo = 2.50 x1osMol 100.09 - 2.50x 10 S MOI EDTA V=n :2.5XIos 0. 001M V = .025 L v= 25 ML EOTA : .001 MED TA ble 1: Titration Data for Parts 1 and 2 Known Solution Known Solution Natural Water Trial 1 Trial 2 Sample nitial Burette Reading (mL) 5.24 mL 15.4 6 mL 3.87 12.니1 mL inal Burette Reading (mL) 15.78 mL 26.19 ml Lo. 40m L 8.54 mu olume Titrant Added (mL) to. 51 ML
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