What is the method of specifying concentration by grams of solute per 100 grams of solution called?

The method of specifying concentration by grams of solute per 100 grams of solution is known as percentage by mass. This approach provides a straightforward way to express how much solute is present in relation to the total mass of the solution, allowing for easy understanding and comparison of concentrations in different solutions.

For instance, if a solution contains 10 grams of salt dissolved in 90 grams of water, its total mass is 100 grams, making the concentration 10% by mass. This percentage indicates that 10 grams of the solute are present in every 100 grams of the solution, which is a useful way to understand the strength or concentration of a solution in practical situations.

Molarity, for example, is a measurement of moles of solute per liter of solution, which has a different focus and unit of measurement. Similarly, molality measures moles of solute per kilogram of solvent, and normality refers to equivalence per liter of solution, each serving distinct purposes in chemistry. These alternative concentration measures do not specifically describe concentration as grams of solute per 100 grams of solution, making percentage by mass the most appropriate term for that description.