Pure substance — definition?
Contains only one element or compound.
Impure substance — role?
Contains a mixture of different substances.
Recognising purity — method?
Use melting and boiling point analysis.
Apparatus for filtration — components?
Filter paper and funnel.
Apparatus for evaporation — purpose?
To remove solvent and recover solids.
Pure water — melting point?
0°C, sharp and specific.
Impure sample — melting point?
Broader range, usually lower than pure.
Mixture — separation technique?
Physical methods exploiting physical differences.
Filtration — residue?
Solid left on filter paper.
Evaporation — process?
Heating solution to vaporize solvent.
Answer 5 questions on Understanding Purity in Substances.
1. When was melting point analysis established as a routine method for assessing the purity of substances in chemistry?
2. Who is credited with proposing the method of recognising purity through melting point analysis?
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