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 & Chemical Reactivity
10th Edition
ISBN:9781337399074
Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Chapter4: Stoichiometry: Quantitative Information About Chemical Reactions
Section4.9: Spectrophotometry
Problem 3.1ACP
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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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