DifferenceModerate1 mark
2(c)
Answer the following questions:
How will you distinguish between Ammonium hydroxide and Sodium hydroxide using copper sulphate solution?
Topic: Qualitative analysis using NaOH and NH₄OH
Previous-year question practice database
Answer
Exam answer
Add CuSO₄: with NH₄OH a pale-blue precipitate dissolves in excess to deep blue; with NaOH a pale-blue precipitate remains insoluble in excess.
Comparison
| NH₄OH | NaOH |
|---|---|
| Cu(OH)₂ dissolves in excess to deep-blue solution. | Cu(OH)₂ remains insoluble in excess. |
More from Analytical Chemistry: Uses of Ammonium Hydroxide and Sodium Hydroxide
A reddish-brown precipitate formed when ferric chloride solution reacts with an alkali.2026the anion and2026the cation present in salt Y.2026Sodium hydroxide is added dropwise to Calcium nitrate solution.2026) ............... solution forms a coloured precipitate with ammonium hydroxide which is soluble in excess of ammonium hydroxide. [Ferrous chloride / Copper nitrate]2025............... conducts electricity by the movement of ions. [Molten iron / Molten sodium chloride]2025