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5536361
Applications of Chlorine
Description
Mind-map of Application of Chlorine including water treatment and bleach for AS-Level Chemistry
No tags specified
chlorine
halogens
group 7
application
water treatment
bleach
as-level
a-level
chemistry
chemistry
paper 1
as - level
Mind Map by
Eleanor H
, updated more than 1 year ago
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Created by
Eleanor H
over 8 years ago
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Resource summary
Applications of Chlorine
Attachments:
Group 7 - Halogens
Bleach (NaClO)
2NaOH + Cl2 --> NaClO + NaCl + H2O
DISPROPORTIONATION REACTION - chlorine is oxidised and reduced
Water Treatment
Cl2 + H20 --> 2H+ + Cl- + ClO-
chlorate(I) ions kill bacteria
Cl2 + H2O --> HOCl + HCl
H0Cl -sunlight-> O2 + 2HCl
Cl2 + H2O --> 4H+ + Cl- + O2
POSITIVES
kills pathogens
some chlorine doesn't react until later, preventing reinfection further on
prevents growth of algae and discolouration caused by organic compounds
removes bad tastes and smells
NEGATIVES
chlorine gas is very harmful if inhaled
liquid chlorine can cause severe chemical burns
can react with organic compounds in water to form chlorinated hydrocarbons which are carcinogenic
e.g. CH3Cl
however, increased cancer risk is small compared to risks from untreated water
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