CH-457
Purity and melting point
Chemistry · Secondary 3 · Medium · Purity and melting point
A sample of impure benzoic acid has a sharp melting point of 118–121 °C. The pure substance melts at 122 °C. What does this suggest about the purity of the sample?
- It is impure because it melts over a range below 122 °C.
- It is pure because the range is only 3 °C wide.
- It is pure because it melts close to 122 °C.
- It is impure because it melts at a higher temperature than 122 °C.
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