1) Suppose that the observed melting point range of a solid was originally 150-160 °C, but this became 145-145.5 °C after recrystallization. How might you account for this observation?
2) For the following melting points, indicate what might be concluded regarding the purity of the sample:
a) 120-122 °C
b) 147 °C
c) 46-60°C
d) 162.5-163.5 °C