Making bleach, Chlorine and water, Water treatment

Question 1

What do you mix together to make bleach

Answer 1

chlorine gas (cl2) and dilute sodium hydroxide (NaOH)

Question 2

what is the bleach made from this

Answer 2

sodium chlorate (I) solution (NaClO)

Question 3

in this reaction chlorine is both reduced and oxidised, what is this reaction called

Answer 3

disproportionation

Question 4

what is the reaction

Answer 4

2NaOH + Cl2 –> NaClO + NaCl + H2O

Question 5

what occurs when you mix chlorine with water

Answer 5

a disproportionate reaction

Question 6

what is the reaction between chlorine and water

not in sunlight

Answer 6

Cl2 + H2O –> 2H(+) + Cl(-) + ClO(-)

Question 7

what is the reaction between Chlorine and water (in sunlight)

Answer 7

Cl2 + H2O –> 2H(+) + 2Cl(-) + 1/2O2

Question 8

How does adding chlorine to water make it safe to drink or swim in

Answer 8

the chlorine reacts and makes Chlorate (I) ions which kill bacteria.

Question 9

why do we chose to treat water with chlorine when chlorine can be toxic

Answer 9

because the risk of using chlorine is much less than the risk of leaving the water untreated.

Question 10

what is another risk associated with using chlorine.

Answer 10

that in water can be some organic compounds, the chlorine could reaction and create chlorinated hydrocarbons which are carinogenic (cancer causing)