Question:
Which of the following aqueous solution has minimum freezing point?
Which of the following aqueous solution has minimum freezing point?
Updated On: Jul 26, 2024
- $0.01\, M\, NaCl$
- $0.005\, M\, NaCl$
- $0.1\, M \,NaCl$
- $0.01\, M\, Na_2SO_4$
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The Correct Option is A
Solution and Explanation
Solution will have highest freezing point if $\Delta T_{f}$ (depression in freezing point) value will be lowest $\Delta T_{f}= i K_{f} m$
where, $i$ =van't Hoff's factor, $K_{f}=$ molal depression constant, $m =$ molality of solution As $k_{f}$ is a constant quantity, so $\Delta T_{f}$ depends upon and only.
For $NaCl , NaCl\to Na ^{+}+ Cl ^{-} i=2$
For $Na _{2} SO _{4}, i=3$; For $C _{12} H _{22} O _{11}, i=1$
$\Delta T_{f}$ value is lowest for $0.01 \,M \,NaCl$, hence, it has highest freezing point.
where, $i$ =van't Hoff's factor, $K_{f}=$ molal depression constant, $m =$ molality of solution As $k_{f}$ is a constant quantity, so $\Delta T_{f}$ depends upon and only.
For $NaCl , NaCl\to Na ^{+}+ Cl ^{-} i=2$
For $Na _{2} SO _{4}, i=3$; For $C _{12} H _{22} O _{11}, i=1$
$\Delta T_{f}$ value is lowest for $0.01 \,M \,NaCl$, hence, it has highest freezing point.
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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.