The purification of aspirin drug from impure aspirin by crystallization is a physical change.
In this process, impure aspirin is dissolved in a suitable solvent, such as ethanol or water, to form a solution. The impurities in the solution are usually insoluble or less soluble in the solvent compared to the aspirin.
Next, the solution is slowly cooled or left to stand undisturbed. As the solution cools, the solubility of the aspirin decreases, causing it to crystallize out of the solution. The impurities, being less soluble, are excluded from the growing crystals.
The crystals of purified aspirin can then be separated from the remaining solution by filtration or decantation. The crystals are typically washed with a small amount of cold solvent to remove any remaining impurities.
Since this process involves the separation of a pure compound from impurities without changing the chemical composition of the aspirin molecule, it is considered a physical change. The chemical structure of the aspirin remains the same throughout the process.
To summarize, the purification of aspirin from impure aspirin by crystallization is a physical change because it involves the separation of a pure compound from impurities without altering the chemical composition of the aspirin molecule. PLEASE GIVE ME BRAINYEST