Chemistry 9701 · AS & A Level · Analytical techniques

Analytical techniques — practice question

Sodium azide, $\text{NaN}_3$, is dissolved in water. Acidified silver nitrate is then added to the solution, producing a white precipitate. After that, aqueous ammonia is added to the white precipitate. The azide ion, $\text{N}_3^-$, shows chemical behaviour similar to the $\text{Cl}^-$ ion. Which row in the table could be predicted from this information?

  • Aformula of white precipitate: $\text{AgN}_3$; colourless solution formed
  • Bformula of white precipitate: $\text{AgN}_3$; precipitate remains
  • Cformula of white precipitate: $\text{Ag}_3\text{N}$; colourless solution formed
  • Dformula of white precipitate: $\text{Ag}_3\text{N}$; precipitate remains

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