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Explain micelle formation in a soap solution. - Chemistry

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प्रश्न

Explain micelle formation in a soap solution.

Explain the formation of a micelle in soap solution.

स्पष्ट करा
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उत्तर

  1. A soap molecule has a long hydrophobic hydrocarbon chain called a tail, which is attached to the hydrophilic ionic carboxylate group, called the head.
  2. In water, the soap molecules arrange themselves to form spherical particles that are called micelles.
  3. In each micelle, the hydrophobic tails of soap molecules point to the center, and the hydrophilic heads lie on the surface of the sphere.
  4. As a result of this, soap dispersion in water is stable.
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पाठ 11: Adsorption and Colloids - Exercises [पृष्ठ १७३]

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बालभारती Chemistry [English] Standard 11 Maharashtra State Board
पाठ 11 Adsorption and Colloids
Exercises | Q 9 | पृष्ठ १७३

संबंधित प्रश्‍न

Comment on the statement that “colloid is not a substance but a state of substance”.


Define the term Electrophoresis.


Identify the dispersed phase and dispersion medium in the following colloidal dispersions.

  1. milk
  2. blood
  3. printing ink
  4. fog

Explain Electrophoresis diagramatically.


What happens when a beam of light is passed through a colloidal sol.


Explain Bredig’s arc method.


Draw labelled diagram Dialysis.


Froth and whipped cream are examples of ____________.


Which one of the following methods is used to make platinum sol?


Which of the following is multimolecular colloid?


In coagulation of positively charged ferric hydroxide sol, the most and least effective ions are ____________ and ____________ respectively.


Which of the following statements is CORRECT?


Which of the following is NOT true for lyophilic colloids?


Mixing of two oppositely charged sols leads to ____________.


Which of the following is multimqlecular colloid?


In which of the following sols there is low affinity between dispersed phase and dispersion medium?


Some colloids are stable by their nature, i.e., gels, alloys, and solid foams. Gelatin and jellies are two common examples of a gel. The solid and liquid phases in a gel are interdispersed with both phases being continuous. In most systems, the major factor influencing the stability is the charge on the colloidal particles. If a particular ion is preferentially adsorbed on the surface of the particles, the particles in suspension will repel each other, thereby preventing the formation of aggregates that are larger than colloidal dimensions. The ion can be either positive or negative depending on the particular colloidal system, i.e., air bubbles accumulate negative ions, sulphur particles have a net negative charge in a sulphur sol, and the particles in a metal hydroxide sol are positively charged. Accumulation of charge on a surface is not an unusual phenomenon-dust is attracted to furniture surfaces by electrostatic forces. When salts are added to lyophobic colloidal systems the colloidal particles begin to form larger aggregates and a sediment forms as they settle. This phenomenon is called flocculation, and the suspension can be referred to as flocculated, or colloidally unstable. If the salt is removed, the suspension can usually be restored to its original state; this process is called deflocculation or peptization. The original and restored colloidal systems are called deflocculated, peptized, or stable sols.

Why does a small amount of salt have such a dramatic effect on the stability of a lyophobic colloidal system? The answer lies in an understanding of the attractive and repulsive forces that exist between colloidal particles. Van der Waals forces are responsible for the attractions, while the repulsive forces are due to the surface charge on the particles. In a stable colloid, the repulsive forces are of greater magnitude than the attractive forces. The magnitude of the electrical repulsion is diminished by addition of ionized salt, which allows the dispersed particles to aggregate and flocculate. River deltas provide an example of this behaviour. A delta is formed at the mouth of a river because the colloidal clay particles are flocculated when the freshwater mixes with the salt water of the ocean.

Colloidal solutions are stable due to ______.


Freshly prepared precipitate sometimes gets converted to colloidal solution by ______.


What is collodion?


What happens when electric field is applied to colloidal solution?


How do emulsifying agents stabilise the emulsion?


Why are some medicines more effective in the colloidal form?


Colloids can


Toluene is oxidised to benzoic acid by


The migration of dispersion medium under the influence of an electric potential is called ______.


Smoke is an example of ______.


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