07/05/2010 (Day 5). WELCOME. http://plkclscmc-timothy.viviti.com/. Chapter 5. The wonderful solvent - WATER. Solvent – 溶劑. A liquid that many substances can dissolve in it. Revision: Impurities (P.55). 3 types of impurities:. - soluble. - insoluble. - micro-organisms.
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The wonderful solvent - WATER
Solvent – 溶劑
A liquid that many substances can dissolve in it.
3 types of impurities:
3 different methods remove different types of impurities.
Alum makes the solid impurities to settle more quickly.
The solid impurities are trapped in the filter column.
What is the colour of the filtrate?
Is the filtrate safe to drink? Why?
NO~ It is because the filtrate may contain soluble impurities and micro-organisms.
Distillation 蒸餾法 (P.64)
1. Boiling, 2. Condensation
It changes from liquid to steam.
Steam changes to water.
The distillate is colourless.
It is water.