[Standardization] A 0.3045 g of CaCO3 primary standard was dissolved using concentrated HCI, evaporated to incipient dryness, and quantitatively transferred to a 250 mL volumetric flask and diluted to mark. A 10 mL of aliquot was then transferred to an Erlenmeyer flask, together with 5mL buffer and 5 drops of EBT indicator, and was used to standardize the EDTA titrant. The solution turned blue after the addition of 24.10 mL of EDTA. A blank correction was made and was determined to be 0.4 mL. [Analysis] A 30 mL unknown water sample was treated with 37.6 mL of EDTA. A blank correction was made and was determined to be 0.4 mL. What is the concentration of CaCO3 of the unknown water sample in ppm? (MW CaCO3 = 100.0869 g/mol)? A 644.11 ppm CaCO3 B) 637.27 ppm CaCO3 633.43 ppm CaCO3 626.71 ppm CaCO3
[Standardization] A 0.3045 g of CaCO3 primary standard was dissolved using concentrated HCI, evaporated to incipient dryness, and quantitatively transferred to a 250 mL volumetric flask and diluted to mark. A 10 mL of aliquot was then transferred to an Erlenmeyer flask, together with 5mL buffer and 5 drops of EBT indicator, and was used to standardize the EDTA titrant. The solution turned blue after the addition of 24.10 mL of EDTA. A blank correction was made and was determined to be 0.4 mL. [Analysis] A 30 mL unknown water sample was treated with 37.6 mL of EDTA. A blank correction was made and was determined to be 0.4 mL. What is the concentration of CaCO3 of the unknown water sample in ppm? (MW CaCO3 = 100.0869 g/mol)? A 644.11 ppm CaCO3 B) 637.27 ppm CaCO3 633.43 ppm CaCO3 626.71 ppm CaCO3
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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Which of the following statements about the BOD test is FALSE?
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The standard test for BOD is the five-day (BOD5) test carried out in the dark at 20 °C
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There is an indirect correlation between the BOD5 value and the level of organic pollutants.
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BOD test measures the oxygen consumed by microorganisms as they break down organic material
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BOD test is a simple an
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