What is the effect of temperature on molarity?

Hint: Molarity is very much affected by temperature. When temperature increases the volume of the solution also increases and this reduces the molarity of the substance. It is also called the molar concentration. It is calculated in moles per liter.

Complete answer:
Molarity (M) is the amount of a substance in a certain volume of solution. Molarity is defined as the moles of a solute per litre of a solution. Molarity is also known as the molar concentration of a solution.
The units of molarity are M or\[\dfrac{{mol}}{L}\]. A \[1M\]solution is said to be “one molar.”
The formula of molarity is: $Molarity(M) = \dfrac{{moles{\text{ }}of{\text{ }}solute}}{{liters{\text{ }}of{\text{ }}solution}} = \dfrac{{mol}}{L}$
Molarity is one of the most widely used units of concentration and is denoted by M. Molar concentration can be used to convert between the mass or moles of solute and the volume of the solution.
Molarity is dependent on temperature. As the temperature increases, water expands, so the solution’s volume therefore increases. In more liters, we have the same number of moles, but the molarity is smaller at higher temperatures. The temperature determines molarity. Molarity is the ratio of the number of solvent moles to the volume of solution in liters, and as the volume increases with increasing temperature, the solution molarity decreases with the temperature rise.

Note:
Molarity and Molality are two different entities. Molality is defined as the total moles of a solute contained in a kilogram of a solvent. It is also known as molal concentration. It is a measure of solute concentration in a solution.