A weight of 14.81 grams of an unknown soil constituent was transferred to a graduated cylinder containing an initial volume of 13.35 ml H2O (see following figure). An additional 7.92 ml H2O was then used to wash down the inside walls of the cylinder, bringing the final volume to 24.66 ml. Find the particle density [Select] and, referring to the table of densities for common soil constituents below, identify the unknown soil constituent [Select] and its chemical composition. [Select] Particle Density (p.) Measurement of Unknown 14.81 g unknown Final volume 24.66 mL Initial volume=13.35 mL mL H₂O cm³ H₂O 7.92 ml Soil Density (g Constituent Composition cm3) Humus Mostly C, H, O 1.3-1.5 Clay Silicates of variable 2.2-2.5 Minerals composition Gypsum CaSO4.2H20 2.32 Orthoclase KAISI308 2.57 Quartz SiO2 2.65 Calcite CaCO3 2.72 2.76 Muscovite KAL3Si3010(OH)2 3.1 Goethite FeOOH 4-37 Magnetite Fe304 5.18

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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A weight of 14.81 grams of an unknown soil constituent was transferred to a
graduated cylinder containing an initial volume of 13.35 ml H2O (see following
figure). An additional 7.92 ml H2O was then used to wash down the inside walls of
the cylinder, bringing the final volume to 24.66 ml. Find the particle density
[Select]
and, referring to the table of densities for common
soil constituents below, identify the unknown soil constituent
[Select]
and its chemical composition.
[Select]
Particle Density (p.) Measurement of Unknown
14.81 g
unknown
Final volume 24.66 mL
Initial volume=13.35 mL
mL H₂O cm³ H₂O
7.92 ml
Soil
Density
(g
Constituent
Composition
cm3)
Humus
Mostly C, H, O
1.3-1.5
Clay
Silicates of variable
2.2-2.5
Minerals
composition
Gypsum
CaSO4.2H20
2.32
Orthoclase
KAISI308
2.57
Quartz
SiO2
2.65
Calcite
CaCO3
2.72
2.76
Muscovite KAL3Si3010(OH)2
3.1
Goethite
FeOOH
4-37
Magnetite
Fe304
5.18
Transcribed Image Text:A weight of 14.81 grams of an unknown soil constituent was transferred to a graduated cylinder containing an initial volume of 13.35 ml H2O (see following figure). An additional 7.92 ml H2O was then used to wash down the inside walls of the cylinder, bringing the final volume to 24.66 ml. Find the particle density [Select] and, referring to the table of densities for common soil constituents below, identify the unknown soil constituent [Select] and its chemical composition. [Select] Particle Density (p.) Measurement of Unknown 14.81 g unknown Final volume 24.66 mL Initial volume=13.35 mL mL H₂O cm³ H₂O 7.92 ml Soil Density (g Constituent Composition cm3) Humus Mostly C, H, O 1.3-1.5 Clay Silicates of variable 2.2-2.5 Minerals composition Gypsum CaSO4.2H20 2.32 Orthoclase KAISI308 2.57 Quartz SiO2 2.65 Calcite CaCO3 2.72 2.76 Muscovite KAL3Si3010(OH)2 3.1 Goethite FeOOH 4-37 Magnetite Fe304 5.18
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