A bottle of a solid is labelled as shown.
The melting point of a sample from the bottle is measured.
The sample melts over a temperature range from 140 °C to 150 °C.
Which statement explains this observation?
The sample contains a mixture of citric acid and other solids.
2 )
The sample is too large.
3 )
The sample has a pH less than 7.
4 )
The sample is too small.
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