This is part of Aim B. This document includes the practical plan ONLY.
This is part of the PASS criteria.
Aim
To construct cooling curves and accurately study the rate of cooling of paraffin wax and stearic acid using calibrated equipment.
Variables
Dependent: Temperature
Independen...
Variables
Dependent: Temperature
Independent: Time
Controls: Mass of samples, type of thermometer, medium in which cooling is
occurring in
Risk assessment
Hazard Risk Precautions
Hot plate Burns, fire risk Handle with care and
turn off when not in use
Melted paraffin wax Burns Handle with care
Melted stearic acid Irritant Gloves, goggles
Glassware Breakages, cuts Handle with care
Brief method
- Place substance, either paraffin wax or stearic acid into beaker on
hot plate
- Allow solid to melt fully
- Place digital thermometer and record temp
- Place in ice bath and record temperature at 30s intervals
- Perform repeats
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