Question:
Equal weights of $NaCl$ and $KCl$ are dissolved separately in equal volumes of solutions. Molarity of the two solutions will be :
Equal weights of $NaCl$ and $KCl$ are dissolved separately in equal volumes of solutions. Molarity of the two solutions will be :
Updated On: Jan 30, 2025
- Equal
- That of NaCl will be less than that of KCl
- That of NaCl will be more than that of KCl
- That of NaCl will be about half of that of KCl solution
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The Correct Option is C
Solution and Explanation
$M _{ KCl }=39+35.5=74.5$
Equal weight $74.5 g$
$n _{ NaCl }=\frac{74.5}{58.5}=1.27$
$n _{ NaCl }=\frac{74.5}{74.5}=1 mole$
Molarity $=\frac{\text { number of moles }}{ V }$
$=\frac{ n }{1 \text { liter }}$
$n _{ NaCl }> n _{ KCl }: M _{ NaCl }> M _{ KCl }$
Equal weight $74.5 g$
$n _{ NaCl }=\frac{74.5}{58.5}=1.27$
$n _{ NaCl }=\frac{74.5}{74.5}=1 mole$
Molarity $=\frac{\text { number of moles }}{ V }$
$=\frac{ n }{1 \text { liter }}$
$n _{ NaCl }> n _{ KCl }: M _{ NaCl }> M _{ KCl }$
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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.