Question:

Hardy-Schulze rule explains the effect of electrolytes on the coagulation of colloidal solution. According to this rule, coagulation power of cations follow the order

Updated On: Jul 6, 2022
  • $\ce{Ba^{+2} > Na^{+} > Al^{+3}}$
  • $\ce{Al^{+3} > Na^{+} > Ba^{+2}}$
  • $\ce{Al^{+3} > Ba^{+2} > Na^{+}}$
  • $\ce{Ba+2 > Al+3 > Na+}$
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The Correct Option is C

Solution and Explanation

According to this law the coagulating effect of an ion on dispersed phase of opposite charge increases with the valency of the ion. The precipitating power of $ {Al^{3+} , Ba^{++}, Na^{+}}$ ions is in order $ {Al^{3+} > Ba^{2+} > Na^{+}}$.
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Notes on Surface Chemistry

Concepts Used:

Surface Chemistry

The study of the chemical phenomena that occur at the interface of two surfaces which can be solid-liquid, solid-gas, solid-vacuum, liquid-gas, etc. 

Read Also: Surface Chemistry

Applications of surface chemistry are:

Adsorption:

The process of attraction and aggregation of the molecules of a substance on the surface of a solid is known as adsorption. For Example, N2 adsorbs on the surface of activated charcoal

Two types of adsorption are:-

  • Chemisorption: It is also known as Chemical Adsorption.
  • Physisorption: It is also known as Physical Adsorption.

Corrosion:

The process through which the refined metals convert themselves into more stable compounds is known as corrosion.

Crystallisation:

The type of technique used in order to purify the substances to separate Solids from liquids is known as crystallisation.

Heterogeneous Catalysis:

The process wherein a catalyst is used in order to increase the rate of a chemical reaction is known as catalysis. The catalyst does not undergo any transformation and can be recovered in a chemically unchanged state. 

There are two types of catalysis:-

  • When the catalyst involved and the reacting substances are same states of matter or in the same phase, it is known as Homogeneous Catalysis.
  • When the catalyst involved and the reacting substances are in different states of matter or different phases, it is known as Heterogeneous Catalysis.