Assignment:
Q1. In a mixture of approximately 20% camphor and 80% naphthalene. What would you expect the melting point to be? (+/-)camphor (175-177 Celsius) and naphthalene (80-81 Celsius).
Q2. Describe the expected type of error in the observed m.p. (unaffected, high, low and/or broad) when the melting point is determined as follows:
a. A melting temperature is used and the rate of heating is 15 Celsius/min.
b. An excessively large sample size is introduced into the capillary tube before using the melting temperature.
Q3. Decide whether the statement is always true. If not, explain when the statement would not be true.
a. An impurity always lowers the melting point of an organic compound.
b. A sharp melting point for an organic substance always indicates a single pure compound.
c. If mixing a sample of compound A with compound X gives a lower melting point than compound X alone, then X and A cannot be identical.
Provide complete and step by step solution for the question and show calculations and use formulas.