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 gBelow is the equilibrium equation from the said experiment (use if needed): 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) Mass of filter paper|0.1010.120.09950.153Mass of Buchner funnel12.0810.19511.38410.282Mass of labeled watch glass15.01226.083 23.41212.305Total mass of equipmentTotal mass of precipitate andequipmentMass of precipitate37.19336.39834.8955 22.7438.93137.61336.4335 24.3071.7381.2150.4621.567Percent Ca in unknown

In order to determine % Ca in unknown, we must first determine the amount of Ca in each ppt.

Answered: Percent Ca in unknown

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Percent Ca in unknown

Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter8: Sampling, Standardization, And Calibration

Section: Chapter Questions

Problem 8.1QAP

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Concept explainers

Solutions

Solutions can be considered as homogeneous mixtures which contain two or more than two chemical substances. The chemical substance which is the greater part is defined as solvent. And the chemical substance that is dissolved in a solvent is referred to as solute. Solution chemistry plays an important role in chemistry since it supports many commercial applications of solutions.

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):

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)

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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