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Mass of CaCO3 standard (g) Volume of CaCO3 used (mL) Volume of EDTA Trial 0.15099 34.90 Trial 2 Trial 3 Trial 4 (if applicable) -> 100.00 mL H₂O 34.10 32.90 used (mL) 10.0 10.0 10.0 Conc. EDTA (M) 0.098 0.100 0.104 Average Conc. EDTA (M) %Relative Standard Deviation (RSD) Mass of unknown Ca2+ (g) Volume of unknown used (mL) Volume of EDTA used (mL) % CaO for Unknown % CaO Average for 28.46 28.05 27.49 10.0 10.0 10.0 0.1007M 2.499% ≈0.14869 -> 100.00 mL H₂O Unknown

Mass of CaCO3 standard (g) Volume of CaCO3 used (mL) Volume of EDTA Trial 0.15099 34.90 Trial 2 Trial 3 Trial 4 (if applicable) -> 100.00 mL H₂O 34.10 32.90 used (mL) 10.0 10.0 10.0 Conc. EDTA (M) 0.098 0.100 0.104 Average Conc. EDTA (M) %Relative Standard Deviation (RSD) Mass of unknown Ca2+ (g) Volume of unknown used (mL) Volume of EDTA used (mL) % CaO for Unknown % CaO Average for 28.46 28.05 27.49 10.0 10.0 10.0 0.1007M 2.499% ≈0.14869 -> 100.00 mL H₂O Unknown

Chemistry & Chemical Reactivity
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
Chapter21: The Chemistry Of The Main Group Elements
Section: Chapter Questions
Problem 120IL
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How do I calculate the %CaO for the unknown? The instructions say to use the Average Concentration of EDTA (0.1007 M) to determine the percentage of CaO. 

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Mass of CaCO3 standard (g) Volume of CaCO3 used (mL) Volume of EDTA used (mL) Conc. EDTA (M) Average Conc. EDTA (M) %Relative Standard Deviation (RSD) Mass of unknown Ca2+ (g) Volume of unknown used (mL) Volume of EDTA used (mL) % CaO for Unknown % CaO Average for Trial 1 Trial 2 0.1509 g 34.90 34.10 Trial 3 Trial 4 (if applicable) -> 100.00 mL H₂O 32.90 10.0 10.0 10.0 0.098 0.100 0.104 0.1007M 2.499% ≈0.14869 →> 100.00 mL H₂O 28.46 28.05 27.49 10.0 10.0 10.0 Unknown
Transcribed Image Text:Mass of CaCO3 standard (g) Volume of CaCO3 used (mL) Volume of EDTA used (mL) Conc. EDTA (M) Average Conc. EDTA (M) %Relative Standard Deviation (RSD) Mass of unknown Ca2+ (g) Volume of unknown used (mL) Volume of EDTA used (mL) % CaO for Unknown % CaO Average for Trial 1 Trial 2 0.1509 g 34.90 34.10 Trial 3 Trial 4 (if applicable) -> 100.00 mL H₂O 32.90 10.0 10.0 10.0 0.098 0.100 0.104 0.1007M 2.499% ≈0.14869 →> 100.00 mL H₂O 28.46 28.05 27.49 10.0 10.0 10.0 Unknown
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