Question

State one observation for the following:

Excess ammonium hydroxide solution is added to lead nitrate solution.

Answer 1

• When ammonium hydroxide solution is added to lead nitrate solution then a chalky white precipitate of lead (II) hydroxide is formed which is insoluble in excess ammonium hydroxide.
• Reaction between lead(II) nitrate and ammonium hydroxide :
• $\mathrm{Pb}{\left({\mathrm{NO}}_3\right)}_2(\mathrm{aq}.)+2{\mathrm{NH}}_4\mathrm{OH}(\mathrm{aq}.)\to \mathrm{Pb}{\left(\mathrm{OH}\right)}_2\downarrow \left(\mathrm{s}\right)+2{\mathrm{NH}}_4{\mathrm{NO}}_3(\mathrm{aq}.)$
  (Lead(II) (Ammonium (Lead(II) (Ammonium
  nitrate) hydroxide) hydroxide) nitrate)
  Chalky white ppt.
• When excess ammonium hydroxide solution is added to lead nitrate solution then the chalky white precipitate of lead (II) hydroxide obtained remains insoluble.