Scientists conducted EDTA titration to check for water hardness, they used two 150 mL samples for the said experiment. The first sample titrated at a pH of 10, required 6.78 mL of 0.03027 M EDTA titrant to reach its endpoint. The following sample was titrated at a pH of 13, so that Mg(OH)2 can be precipitated out, and it required 4.65 mL of the same titrant to reach endpoint. The molecular weights are as follows: Ca = 40.08, Mg = 24.31, CaCO3 = 100.087 and MgCO3 = 84.314, answer the following questions: 1. What is the total hardness of the water found? (in ppm CaCO3) 2. What is the concentration of Ca in the water sample? (in ppm CaCO3) 3. What is the concentration of Mg in the water sample? (in ppm MgCO3)
Scientists conducted EDTA titration to check for water hardness, they used two 150 mL samples for the said experiment. The first sample titrated at a pH of 10, required 6.78 mL of 0.03027 M EDTA titrant to reach its endpoint. The following sample was titrated at a pH of 13, so that Mg(OH)2 can be precipitated out, and it required 4.65 mL of the same titrant to reach endpoint. The molecular weights are as follows: Ca = 40.08, Mg = 24.31, CaCO3 = 100.087 and MgCO3 = 84.314, answer the following questions: 1. What is the total hardness of the water found? (in ppm CaCO3) 2. What is the concentration of Ca in the water sample? (in ppm CaCO3) 3. What is the concentration of Mg in the water sample? (in ppm MgCO3)
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Scientists conducted EDTA titration to check for water hardness, they used two 150 mL samples for the said experiment. The first sample titrated at a pH of 10, required 6.78 mL of 0.03027 M EDTA titrant to reach its endpoint. The following sample was titrated at a pH of 13, so that Mg(OH)2 can be precipitated out, and it required 4.65 mL of the same titrant to reach endpoint.
The molecular weights are as follows: Ca = 40.08, Mg = 24.31, CaCO3 = 100.087 and MgCO3 = 84.314, answer the following questions:
1. What is the total hardness of the water found? (in ppm CaCO3)
2. What is the concentration of Ca in the water sample? (in ppm CaCO3)
3. What is the concentration of Mg in the water sample? (in ppm MgCO3)
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