Water And Water Hardness Flashcards
What is the freezing and boiling point of water
Freezing: 0 degrees
Boiling: 1000
How do you test for water
Water turns anhydrous copper sulphate from white-blue
What is the composition of water
H20
What does anhydrous mean
No water
What is the cycle of water
Evaporation Transport Sublimation Condensation Transportation Precipitation Deposition Infiltration Surface flow Plant uptake
What is screening
Removal of waste in water through a mesh screen
What is settling
Aluminium sulphate is added to the water in large tanks, it causes smaller particles to settle at the bottom
What is filtration
The water is passed through sand to remove smaller particles
What is chlorination
Chlorine is added to the water to kill bacteria
What is fluoridation
Fluorine is sometimes added to the water to prevent tooth decay
What does hard water mean
It does not lather easily
It is caused by dissolved compounds (mainly calc/magnesium)
How can water hardness be removed
Using an ion exchanger
Name advantages of hard water
Source of calcium
Most people prefer taste
Disadvantages of hard water
Limescale blocks pipes and reduces Efficiency
Wastes soap and leaves scum on clothes
What is meniscus
Curved surface of liquid in a vessel
