Water Flashcards
1
Q
Water
A
Universal Solvent
Prime Agent
To be effective, used along with other agents
Soft water is ideal for cleaning purpose
2
Q
PPM
A
Parts Per Million
3
Q
Soft
A
> 60 ppm of calcium or magnesium
4
Q
Moderately Hard
A
61 - 120 ppm
5
Q
Very Hard
A
< 180 ppm
6
Q
Temporary Hardness Removal
A
bi carbonate of calcium and magnesium which can be removed by heating water above 72ºC
7
Q
Permanent Hardness Removal
A
Sulphates and chlorides of calcium and magnesium which can be removed by chemical treatment.
8
Q
Method of Softening
A
- Alkali method, lime soda method,
- EDTA (ethylene diamine tetraacetic acid), NTA (nitrilo triacetic acid),
- Zeolite method
9
Q
Effects of hard water
A
- Lather formation
- Lots of scum
- Ageing of fabric
- Scales in equipment
- Sulphur – rotten egg smell
10
Q
A
