The melting point of aspirin : 128-137Celsius degree.
The melting point of the crude aspirin was measured to be 128 Celsius degree. What does it indicate about the purity of the product?
According to Wikipedia, the melting point of pure aspirin is 135 C. A melting point of 128 indicates it isn't very pure.
The measured melting point of the crude aspirin being 128 degrees Celsius indicates that the product is likely impure. The standard melting point range for aspirin is typically 128-137 degrees Celsius. If the measured melting point falls within this range, it suggests that the aspirin is relatively pure. However, the fact that the melting point of the crude aspirin is at the lower end of this range implies that impurities are present.
When it comes to determining the purity of a substance based on its melting point, a narrower and higher melting point range usually indicates higher purity. Impurities present in a substance can lower its melting point and broaden the range at which it melts. In the case of aspirin, the impurities in the crude product likely contribute to the observed lower melting point of 128 degrees Celsius.
To obtain a purer form of aspirin, further purification methods such as recrystallization or chromatography may be necessary. These methods can help remove the impurities and bring the melting point closer to the standard range. By repeating the purification process and measuring the melting point after each step, one can track the increasing purity of the aspirin product as the melting point approaches the desired range of 128-137 degrees Celsius.