Question:

The molarity of pure water is:

Updated On: Apr 12, 2024
  • 100
  • 55.6
  • 18
  • 5.56
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The Correct Option is B

Solution and Explanation

At 25°C, density of water = 1 g/ml

1 g = 1 ml

So, 1000 g = 1000 ml

Now, number of moles of water \(=\frac{1000}{18}=55.55 \,mol\) 

Molarity of water \(=\frac{55.6}{1 \,L }=55.55\, M\)

Hence, the molarity of pure water is 55.6 M. 

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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:

  1. Unsaturated Solution- A solution in which more solute can be dissolved without raising the temperature of the solution is known as an unsaturated solution.
  2. 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.
  3. Supersaturated Solution- A solution that contains more solute than the maximum amount at a certain temperature is known as a supersaturated solution.