Definition

1. Noun:
   • A measure of concentration in chemistry: Molarity is a specific way to express the concentration of a solute in a solution. It is defined as the number of moles of a solute dissolved in one liter of solution.

Usage

• Molarity is a standard unit of concentration used in chemical calculations, particularly in solutions chemistry. It is used to quantify how much of a substance is present in a given volume of liquid.
• The symbol for molarity is typically a capital M. For example, a "1 M solution" means a solution with a concentration of 1 mole per liter.

Examples

Advanced Usage

• "Molarity vs. Molality": A common point of confusion. While molarity (M) is moles of solute per liter of , molality (m) is moles of solute per kilogram of . Molality is temperature-independent, whereas molarity can change with temperature because the volume of a solution expands or contracts.
• Formal Expression: Molarity (M) = (moles of solute) / (liters of solution).

Variants and Related Words

• Molar (adj): Pertaining to moles or molarity. Example:
• Mole (n): The SI base unit for amount of substance, fundamental to the definition of molarity.

Synonyms

• Molar concentration: The full technical term for molarity.
• Formal concentration: In some contexts, this can be synonymous with molarity for certain types of solutes.

Related Phrases and Concepts

• "Dilution": The process of reducing the molarity of a solution by adding more solvent.
• "Standard Solution": A solution whose precise molarity is known, used in titrations.

Noun

1. concentration measured by the number of moles of solute per liter of solution