You have synthesized a substance from aqueous solution that has a melting point of 152 °C. A pure authentic sample of the intended product has a melting point of 154 °C. The most likely explanation for the difference in melting temperature is that the your product is
a totally different compound than the intended product.
not completely dried.
Chemistry - DrBob222, Friday, June 11, 2010 at 8:10pm
a is the most probable answer.