The w/w (mass percentage) mode of expressing concentration is independent of temperature because it represents the ratio of the mass of the solute to the total mass of the solution, and changes in temperature do not alter this ratio.
The w/w (mass percentage) mode of expressing concentration is a measure of the amount of solute in a solution relative to the total mass of the solution. It is calculated by taking the ratio of the mass of the solute to the total mass of the solution and multiplying by 100 to express it as a percentage. In this mode, the temperature independence arises from the fact that mass is a scalar quantity that remains constant regardless of temperature changes.
The numerator (mass of solute) and the denominator (total mass of the solution) are both influenced by temperature equally, and their ratio remains constant. As the temperature of the solution changes, both the solute and the solvent experience proportional changes in mass, maintaining the same mass percentage. Therefore, w/w concentration is considered independent of temperature, making it a reliable mode for expressing the concentration of a solution, especially when dealing with temperature variations.