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Question:
The pH of M/100 NaOH solution is :
The pH of M/100 NaOH solution is :
Updated On: Jun 23, 2023
- 2
- 10
- 6
- 12
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The Correct Option is D
Solution and Explanation
NaOH completely ionises as
$ \, \, \, \, \, \, \, \, \, \, NaOH \rightarrow \, Na^+ +OH^-$
$\therefore \, \, \, \, [OH^-]=[NaOH]=\frac{M}{100}=10^{-2}M$
Now,as $ \, \, \, \, \, \, [H_3O^+][OH^-]=10^{-14}$
$or \, \, \, \, \, \, \, \, \, \, \, \, \, \, [H_3O^+] =\frac{10^{-14}}{[OH^-]}=\frac{10^{-14}}{10^{-2}}=10^{-12}$
$\therefore \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, pH=-log[H_3O^+]$
$ \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, =-log \, 10^{-12}$
$\, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, \, pH=12$
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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.
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