Question

what is the use of a stirrer in the experimenting of napthalene melting point

Answer 1

Answer:

• Next, check the results for the pure urea sample. Why is urea's melting point so much higher than naphthalene's? Looking at the structure of naphthalene, the intermolecular forces must be primarily London dispersion forces. Urea is capable of hydrogen bonding, so the intermolecular forces in solid urea are much stronger than the forces in solid naphthalene.

Finally, look at the results from the urea sample with the impurity. The melting point range should be broader and lower than the range for pure urea because of freezing point depression. As expected, the melting point range obtained was 127 – 130°C, which is lower than the range for pure urea.