Determining purity

Pure substance
-only one substance
- determine by checking melting point of a solid
- determine by checking the boiling point of a liquid
- determine using chromatography

Pure solid
- exact and constant melting point

Pure liquid
- exact and constant boiling point

Effect of impurities on melting point
- greater the amount of impurities, the lower the melting point, and cause melting to take place over a range of temperature

Effect of impurities on boiling point
-if liquid is impure, the boildin point will increase and it will also boil over a range of temperatures, the greater the amount of impurities, the the higher the boiling point of liquid

Effect of pressure on boiling point
-if pressure surrounding a liquid increase, it's boiling point will increase.