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Soil Colloids: General Properties

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Questions and Answers

How are soil colloids observed?

Using a magnifying glass

Using an ordinary light microscope

Using an electron microscope (correct)

Without any special equipment

What is the size of soil colloids?

Less than 0.001 mm (correct)

More than 2 micrometers

Between 0.001 - 0.002 mm

Between 1 - 2 micrometers

What is the total surface area of soil colloids?

More than 1000 m2/g

Ranges from 10 m2/g to more than 800 m2/g (correct)

Exactly 500 m2/g

Less than 10 m2/g

What gives rise to an ionic double layer in soil colloids?

<p>Negative charge of soil colloids attracting positive ions</p> Signup and view all the answers

What do soil colloids attract on their surfaces?

<p>Cations like H+, Al3+, Ca2+ and Mg2+</p> Signup and view all the answers

Study Notes

Observing Soil Colloids

Soil colloids are observed using techniques such as electron microscopy, centrifugation, and chromatography.

Characteristics of Soil Colloids

The size of soil colloids ranges from 1-1000 nanometers (nm) in diameter.

Surface Area of Soil Colloids

The total surface area of soil colloids is very large due to their small size.

Ionic Double Layer in Soil Colloids

The ionic double layer in soil colloids is formed when the colloid surface reacts with ions in the surrounding solution, creating a layer of opposite charge.

Attraction on Soil Colloid Surfaces

Soil colloids attract and hold ions, water, and organic compounds on their surfaces through electrostatic forces, hydrogen bonding, and van der Waals interactions.

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Description

Learn about the general properties of soil colloids, including their small size and colloidal nature. Understand the characteristics of clay fraction and the specific size range of particles with colloidal properties.