Question

If a second melting point has to be taken, why is it necessary to use a fresh sample?

a) To confirm the results
b) To prevent contamination
c) To save time
d) To reduce waste

Answer 1

When taking a second melting point, it is necessary to use a fresh sample to prevent contamination.

Step-by-step explanation:

When taking a second melting point, it is necessary to use a fresh sample to prevent contamination. Contamination can occur if the previous sample was exposed to impurities or substances that could affect the melting point. By using a fresh sample, we can ensure that the melting point measurement is accurate and reliable.