Answer to Question #137332 in General Chemistry for Fatima

Question

Why in ClO:- + H:+ + I:- = Cl:- + I2 + H2O equation the concentration of ClO:- = 100 × number of mole of I2

Answer 1

To produce chlorine dioxide gas, hydrochloric acid (HCl) or chlorine is brought together with sodium chlorite.

The to main reactions are:

2NaClO₂ + Cl₂ ® 2ClO₂ + 2NaCl

(Acidified hypochlorite can also be used as an alternative source for chlorine.)

And:

5 NaClO₂ + 4HCl ® 4 ClO₂ + 5NaCl + 2H₂O

(One disadvantage of this method is that it is rather hazardous.)

An alternative is:

2 NaClO₂ + Na₂S2O₈ ® 2ClO₂ + 2Na2SO₄

[ClO-]=100×n(I2)

12n = 100

n= 100/12

n= 8.3333