Molarity is a way to express the concentration of a solution. It is defined as the number of moles of a solute (the substance being dissolved) per liter of solution. The formula for calculating molarity is: M = moles of solute / liters of solution. This measurement helps chemists understand how concentrated a solution is, which is important for reactions and experiments. To find the number of moles, you can use the formula: moles = mass (in grams) / molar mass (in grams per mole). Molarity is commonly used in chemistry labs and is essential for preparing solutions with precise concentrations for various applications, including titrations and chemical reactions.