LAQ : Write with equation the following properties of H2S.(i) acidic (ii) reducing and (iii) Precipitation

Question

Write with equation the following properties of H₂S.(i) acidic (ii) reducing and (iii) Precipitation. 

Answer

(i) H₂S is acidic and reacts with metal hydroxides to form corresponding sulfides and water. For example, with sodium hydroxide:

H₂S (g) + 2 NaOH (aq) → Na₂S (aq) + 2H₂O (l)

(ii) H₂S is a reducing agent and can reduce metal ions to their elemental forms. For example, with silver nitrate:

H₂S (g) + 2AgNO₃ (aq) → 2Ag (s) + 2HNO₃ (aq) + S (s)

(iii) H₂S can form insoluble metal sulfides when reacted with metal ions in aqueous solutions. For example, with lead (II) nitrate:

H₂S (g) + Pb(NO₃)₂ (aq) → PbS (s) + 2HNO₃ (aq)