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Questions and Answers
What is the nature of interaction between dispersed phase and dispersion medium in lyophilic colloids?
What is the nature of interaction between dispersed phase and dispersion medium in lyophilic colloids?
- Neutral interaction between the two phases
- Repulsion between the two phases
- Great affinity for the dispersion medium (correct)
- No interaction between the two phases
What is the size range of colloidal particles?
What is the size range of colloidal particles?
- Less than 1nm
- Greater than 1000nm
- Exactly 1000nm
- Approximately 1nm – 1000nm (correct)
What does the word 'colloid' come from?
What does the word 'colloid' come from?
- The Greek word “kolla” which means glue (correct)
- The Sanskrit word “kola” which means mixture
- The Latin word “collum” which means neck
- The Arabic word “qolad” which means mixture
How do colloidal particles behave when passed through a filter paper and a semipermeable membrane?
How do colloidal particles behave when passed through a filter paper and a semipermeable membrane?
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How do lyophilic colloids settle?
How do lyophilic colloids settle?
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Study Notes
Characteristics of Lyophilic Colloids
- In lyophilic colloids, the dispersed phase has a strong affinity for the dispersion medium, resulting in a stable interaction between the two.
Size of Colloidal Particles
- Colloidal particles have a size range of 1-100 nanometers (nm) in diameter.
Etymology of the Word "Colloid"
- The word "colloid" comes from the Greek word "kollodes", meaning "glue-like".
Behavior of Colloidal Particles through Filters
- When colloidal particles are passed through a filter paper, they pass through easily because of their small size.
- However, when passed through a semipermeable membrane, colloidal particles are retained, while smaller particles like solutes can pass through.
Settling of Lyophilic Colloids
- Lyophilic colloids do not settle or precipitate out of the solution, even on standing for a long time, due to their strong interaction with the dispersion medium.
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