A standard solution is defined by what characteristic?

A standard solution is defined primarily by its strength, which refers to the concentration of a solute in a solution. The strength indicates how much of the chemical is present in a given volume of the solution, often expressed in terms of molarity or other concentration units. This characteristic is crucial in analytical chemistry and various applications, as a standard solution with a known strength is necessary for titrations and calibrations.

Other characteristics such as color, volume, and temperature do not inherently define a standard solution. While these properties can influence reactions and measurements, they are not defining attributes. For example, solutions of the same strength can vary in color, and solutions of the same color can have different strengths. Similarly, the volume of a solution is important for practical applications but does not define its standard nature. Temperature can affect the solubility and reaction rates but also does not constitute the definition of a standard solution.