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
impure.
ultrapure.
a totally different compound than the intended product.
not completely dried.
a is the most probable answer.
The most likely explanation for the difference in melting temperature between your synthesized substance and the pure authentic sample is that your product is impure.
To verify this explanation, you should understand that melting point is a physical property that can be used to determine the purity of a substance. Pure substances have a fixed melting point, meaning they melt at a specific temperature. When a substance is impure, its melting point can be lower or higher than the expected value for the pure compound.
To confirm if your product is impure, you can perform a melting point determination. Start by taking a small amount of your synthesized substance and a small amount of the pure authentic sample. Place these samples separately in capillary tubes or on a melting point apparatus. Gradually heat the samples until they melt and record the temperature at which each sample melts.
If the melting point of your synthesized substance is lower than the melting point of the pure authentic sample (152 °C in your case), it suggests that your product is impure. The impurities present in your synthesized substance can lower the melting point.
Therefore, the correct explanation in this scenario is that your synthesized substance is impure.