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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Question
Gravimetric determination of Calcium as CaC2O4·H2O: Determine the Percent Ca in Unknown for all four trials of the lab experiment. Mass of CaCO3 unknown in stock solution = 1.239 g
Below is the equilibrium equation from the said experiment (use if needed):

Transcribed Image Text:СаCОз (s) + 2н* (аq)
Са2* (аq) + Hа0 () + СО2 (9)
(1)
Нeat
(H-N)2CO (аq) + Hа0 ()
2NH3 (aq) + CO2 (g)
(2)
2NH3 (aq) + H2C,04 (аq)
2NĦ, Taq) + C204²° (aq)
(3)
Са2* (аq) + C20,2 (aq) + Hа0 ()
CaC204 H2O (s)
(4)

Transcribed Image Text:Mass of filter paper
|0.101
0.12
0.0995
0.153
Mass of Buchner funnel
12.08
10.195
11.384
10.282
Mass of labeled watch glass
15.012
26.083 23.412
12.305
Total mass of equipment
Total mass of precipitate and
equipment
Mass of precipitate
37.193
36.398
34.8955 22.74
38.931
37.613
36.4335 24.307
1.738
1.215
0.462
1.567
Percent Ca in unknown
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