Question:
For $1$ molal aqueous solution of the following compounds, which one will show the highest freezing point ?
For $1$ molal aqueous solution of the following compounds, which one will show the highest freezing point ?
Updated On: Oct 10, 2024
- $[Co(H_2O)6]Cl_3 $
- $[Co(H_2O)_5Cl]Cl_2.H_2O$
- $[Co(H_2O)_4Cl_2]Cl._2H_2O $
- $[Co(H_2O)_3Cl_3]._3H_2O $
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The Correct Option is D
Solution and Explanation
The solution which shows maximum freezing point must have minimum number of solute particles.
(1) $\left[ Co \left( H _{2} O \right)_{6}\right] Cl _{3} \rightarrow\left[ Co \left( H _{2} O \right)_{6}\right]^{3+}+3 Cl ^{-}, i =4$
(2) $\left[ Co \left( H _{2} O \right)_{5} Cl \right] Cl _{2} \cdot H _{2} O \rightarrow\left[ Co \left( H _{2} O \right)_{5} Cl \right]^{2+}+2 Cl ^{-},i=3$
(3) $\left[ Co \left( H _{2} O \right)_{4} Cl _{2}\right] Cl \cdot 2 H _{2} O \rightarrow\left[ Co \left( H _{2} O \right)_{4} Cl _{2}\right]^{+}+ Cl,i=2$
(4) $\left[ Co \left( H _{2} O \right)_{3} Cl _{3}\right] \cdot 3 H _{2} O \rightarrow\left[ Co \left( H _{2} O \right)_{3} Cl _{3}\right], i =1$
So, solution of $1$ molal $\left[ Co \left( H _{2} O \right)_{3} Cl _{3}\right] \cdot 3 H _{2} O$ will have minimum number of particles in aqueous state.
(1) $\left[ Co \left( H _{2} O \right)_{6}\right] Cl _{3} \rightarrow\left[ Co \left( H _{2} O \right)_{6}\right]^{3+}+3 Cl ^{-}, i =4$
(2) $\left[ Co \left( H _{2} O \right)_{5} Cl \right] Cl _{2} \cdot H _{2} O \rightarrow\left[ Co \left( H _{2} O \right)_{5} Cl \right]^{2+}+2 Cl ^{-},i=3$
(3) $\left[ Co \left( H _{2} O \right)_{4} Cl _{2}\right] Cl \cdot 2 H _{2} O \rightarrow\left[ Co \left( H _{2} O \right)_{4} Cl _{2}\right]^{+}+ Cl,i=2$
(4) $\left[ Co \left( H _{2} O \right)_{3} Cl _{3}\right] \cdot 3 H _{2} O \rightarrow\left[ Co \left( H _{2} O \right)_{3} Cl _{3}\right], i =1$
So, solution of $1$ molal $\left[ Co \left( H _{2} O \right)_{3} Cl _{3}\right] \cdot 3 H _{2} O$ will have minimum number of particles in aqueous state.
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Concepts Used:
Solutions
A solution is a homogeneous mixture of two or more components in which the particle size is smaller than 1 nm.
For example, salt and sugar is a good illustration of a solution. A solution can be categorized into several components.
Types of Solutions:
The solutions can be classified into three types:
- Solid Solutions - In these solutions, the solvent is in a Solid-state.
- Liquid Solutions- In these solutions, the solvent is in a Liquid state.
- Gaseous Solutions - In these solutions, the solvent is in a Gaseous state.
On the basis of the amount of solute dissolved in a solvent, solutions are divided into the following types:
- Unsaturated Solution- A solution in which more solute can be dissolved without raising the temperature of the solution is known as an unsaturated solution.
- Saturated Solution- A solution in which no solute can be dissolved after reaching a certain amount of temperature is known as an unsaturated saturated solution.
- Supersaturated Solution- A solution that contains more solute than the maximum amount at a certain temperature is known as a supersaturated solution.