Which Mixture of the Solution Will Lead to the Formation of Negatively Charged Colloids of [AgI]I- sol?

By K Balaji|Updated : November 12th, 2022

(a) 50mL of 1MAgNO3 + 50ml of 2MKI

(b) 50mL of 2MAgNO3 + 50ml of 1.5 MKI

(c) 50mL of 1MAgNO3 + 50ml of 1.5MKI

(d) 50mL of 0.1MAgNO3 + 50ml of 0.1MKI

The mixture of the solution 50mL of 1MAgNO3 + 50ml of 1.5MKI will lead to the formation of negatively charged colloids of [AgI]I- sol.

Explanation for the correct option:

(c) 50mL of 1MAgNO3 + 50ml of 1.5MKI

The iodide ion I will be absorbed in the surface of the AgI particles, giving them a negative charge: "The colloidal sol AgI is created by adding KI solution to the AgNO3 solution until KI is in slightly excess."

AgI + I→ AgI: I

The reaction that takes place when AgNO3 and KI react together can be depicted as:

AgNO3(aq)+KI(s)→AgI(aq)+KNO3(aq)

As a result, the concentration of KI must be somewhat higher than necessary in order to surround the silver iodide with iodide ion AgNO3. Thus, the concentration will be 50mL of 1MAgNO3 + 50ml of 1.5MKI

Explanation for incorrect options:

The concentration of KI must be slightly more than AgNO3. Thus, options A, B, and C stand incorrect.

Uses of Colloids

Colloids are extensively used in commercial, home, and medicinal purposes.

  1. Syrup, halwa, and soup all fall under the category of colloidal food items.
  2. Medicine: Argyrols, a brand of colloidal silver, works as an antiseptic for eye infections.
  3. The Cottrell precipitator air purification technology includes a process called solution particle coagulation. Pure air departs through a different outlet when dust or smoke enters an electrified chamber with a central electrical plate that has the opposite charge of a smoke particle. This causes the dust or smoke to congeal.
  4. Animal skins are very soft, thus tanning involves soaking them in a solution of tannin that has the opposite charge to the animal skin. This causes the particles in the skin to coagulate, making the skin rigid.
  5. Delta formation: It entails the coagulation of river clay particles with a seawater electrolyte.

Hence, the correct option is (c) 50mL of 1MAgNO3 + 50ml of 1.5MKI

Summary:-

Which Mixture of the Solution Will Lead to the Formation of Negatively Charged Colloids of [AgI]I- sol? (a) 50mL of 1MAgNO3 + 50ml of 2MKI (b) 50mL of 2MAgNO3 + 50ml of 1.5 MKI (c) 50mL of 1MAgNO3 + 50ml of 1.5MKI (d) 50mL of 0.1MAgNO3 + 50ml of 0.1MKI

The mixture of the solution 50mL of 1MAgNO3 + 50ml of 1.5MKI will lead to the formation of negatively charged colloids of [AgI]I- sol

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