Potable Water (OCR GCSE Chemistry A (Gateway Science Suite)): Flashcards
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Definition of potable water
Definition of potable water
Water safe to drink, treated to remove harmful substances
Purpose of filtration in water treatment
Purpose of filtration in water treatment
Remove insoluble particles
Purpose of sterilisation in water treatment
Purpose of sterilisation in water treatment
Kill harmful microbes
Three methods to sterilise water
Three methods to sterilise water
Chlorine, ozone, ultraviolet light
What is desalination?
What is desalination?
Making seawater potable
Main method of desalination
Main method of desalination
Distillation (boiling seawater)
Key characteristic of desalination
Key characteristic of desalination
Energy-intensive and costly
Alternative desalination method
Alternative desalination method
Membrane systems
What is fluoridation?
What is fluoridation?
Adding fluoride to water supply
Benefit of fluoride in water
Benefit of fluoride in water
Prevents tooth decay
First UK fluoridation scheme (location & year)
First UK fluoridation scheme (location & year)
Birmingham, 1964
Who decides on water fluoridation?
Who decides on water fluoridation?
Individual local authorities
Risk of high fluoride concentration
Risk of high fluoride concentration
Fluorosis (tooth discolouration/decay)
Argument against fluoridation
Argument against fluoridation
Mass medication, forced consumption
Dissolved substances in fresh water
Dissolved substances in fresh water
Low levels