Assertion: benzoic acid's amount | /r/HasProperty | pure the substance
Facets:
Source sentences:
text: In addition, the presence of impurities will affect the melting point of a substance in a predictable way: impurities always lower the melting point, no matter what impurities are present, and the amount of change will depend on the amount of the impurity--the less pure the substance, the greater the depression in the melting point.