Question

a)Name the gas in each of the following.

b) State one observation for each of the following.

Sodium hydroxide solution is added to ferric chloride solution at first a little and then in excess.

Answer 1

a) No gas is formed when sodium hydroxide solution react with excess ferric chloride solution.

b) When sodium hydroxide solution is added to ferric chloride solution, a reddish brown precipitate is formed.

• This is due to the formation of ferric hydroxide.
• FeCl₃(aq)+ 3 NaOH(aq)$\to$Fe(OH)₃(s) +3NaCl(aq)
• When excess reagent is added it does not change.