melting point analysis Flashcards
1
Q
what is the melting point
A
the temperature range over which the solid first begins to melt, to when all of the solid has melted
2
Q
how can the identity of a pure compound be confirmed
A
by melting point analysis and a comparison of the experimentally determined melting point with a literature of known melting point value
3
Q
what can the determination of the melting point of a compound give an indication of
A
the purity of a compound
4
Q
what does the presence of impurities in a compound do
A
it lowers the melting point and broadens its melting temperature range due to the disruption in intermolecular bonding in the crystal lattice
5
Q
what does the determination of a mixed melting point involve
A
- mixing a small quantity of the product with some of the pure comoound and determining the melting point
- the melting point value cand the range of the melting temperature can be used to determine if the product and the pure compound are the same substance
