Group 7 Flashcards
1
Q
The disproportionation of chlorine with water
A
Cl2 + H2O –> HCl + HClO
This acid produced kills any bacteria in the water
2
Q
The disproportionation of chlorine with cold, dilute NaOH
A
Cl2 + 2NaOH –> NaClO + NaCl + H2O
The NaClO is bleach.
3
Q
What are the benefits and risks of using chlorine in water treatment
A
+Bacteria easily killed
- Cl2 gas is toxic
- Chlorinated hydrocarbons could form
4
Q
What are the colours of halogens in water and in organic solvent
A
Cl is clear in water and yellow in OS
Br is orange in water and orange in OS
I is brown in water and pink in OS
