Chemical Process
Contact process of sulphuric acid manufacture

Eliminates absorber
Yields acid of higher concentration than chamber process
Yields acids of lower concentration than chamber process
Is obsolete

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Chemical Process
Use of hydrated lime in water treatment

After filtration, combats the corrosive-ness of water due to the presence of O₂ & CO₂
Before filtration, reduces the bacterial load on filters
All of these
Is to adjust the pH value

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