Question

When h2s gas is passed through an acidified solution of k2cr2o7 the solution becomes milky explain?

Answer 1

• When $H_2S$ gas is passed through an acidified solution of $K_2Cr_2O_7$ the solution becomes milky due to formation of sulfur.

• The chemical equation for the following reaction is as follows: $3H_2S + 8HCl + K_2Cr_2O7$ → $2CrCl_3 + 7H_2O + 3S + KCl$
• So, from the above chemical reaction it can be seen that sulfur (S) is formed as one of the products which is responsible for making the solution milky whereas the formation of chromyl chloride i.e. $CrCl_3$ gives green color.