| time
requ.: |
15 minutes. |
|
objective: |
States of matter, determination of the melting
point |
| material: |
- beaker 50ml
- thermometer
- wire frame
|
|
| chemicals: |
|
|
|
procedure: |
Fill beaker
half with stearic acid. Heat it until all matter is molten and temperatur is about 100°C.
Put out the burner and let cool down. Determine temperature of substance all 30s.
Note in a table. Draw a T/t-graph. |
|
observation: |
At 70°C the
temperature is stable for a period of time. |
|
interpretation: |
The melting
point of stearic acid is 70°C. |
|
disposal of: |
Use again. |
|
source: |
Barke, H.-D. et al.: One Hundred
Chemistry-Experiments to Avoid Chalk and Talk; University of Muenster,
2004. |
