halogens

Question 1

chlorine in cold alkali (15 oC)

Answer 1

Cl2(aq) + 2NaOH (aq) –> NaCl (aq) + NaClO (aq) + H2O (l)

Question 2

chlorine in water purification

Answer 2

Cl2 (aq) H2O (l) –> HCl (aq) + HClO (aq) (reversible reaction arrow)

Question 3

reaction of chlorine for water purification in sunlight

Answer 3

2Cl2 (g) + 2H2O (l) → 4HCl (aq) + O2 (g)