salt 10 Slaking quicklime = exothermic reaction with water

During adding water to quicklime the calciumoxide in it does a chemical reaction with water. A big quantity of heat is released that makes excess water boiling (Photo 2). This process is called slaking. The new product is slaked lime. It contains calcium hydroxide.

Material
Tray, Goggles, gloves, digital multimeter with thermo couple, blister, quicklime of the previous experiment. ( CaCO₃).
Experiment
1. Add drops of water to the piece of quicklime ("Branntkalk").
2. Measure the change of temperature.
3. Look for more changes.
Observations
a) The temperature rises dramatically (Photo 1, 2).
b) The volume of the sample increases.
c) The blister melts.
d) By adding more water and shaking a milky liquid is obtained that separates by precipitation of a white solid (Photo 5, 6).
Explanation
This chemical reaction is called slaking of lime, new substance = calcium hyroxide. The milky liquid is a supension called lime milk, the transparent liquid Lime water.