Question

2. An unknown white solid has melting point range 119 – 121o C. Benzoic acid is a white solid of 122 o C melting point. How can a student confirm the identity of the unknown solid (is the benzoic acid or not)

Answer 1

Take a mixed melting point with pure benzoic acid. If the unknown is benzoic acid the mixed melting point will not change from the pure stuff. If the unknown is lower it isn't benzoic acid.

Answer 2

I think it is a benzoic acid but it is impure