1. What is the effect of insoluble impurity, such as sodium sulfate, on the observed melting point of a compound?
2. 3 test tubes labeled A,B & C, contain substances with approximately the same the same melting points. How could you prove that the test tubes contain 3 different chemical compounds?
3. One of the most common causes of inaccurate melting points is too rapid heating of melting point bath.Under this condition how will the observed melting point compare to the true melting point?