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
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ISBN:9781305957404
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Chapter1: Chemical Foundations
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Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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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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