Q1
What does NaOH form with metal salt solutions?
AA coloured precipitate
BA colourless gas only
CNo reaction
DAn explosion
ICSEClass 10 (ICSE)ChemistryCh 4 · Topic 2
Practice and Revision - Analytical Chemistry - Use of Ammonium Hydroxide and Sodium Hydroxide
Let us practise and revise what we learned about analytical chemistry - use of ammonium hydroxide and sodium hydroxide. Ammonium hydroxide a
Core concept
Adding sodium hydroxide to a metal salt solution can form a coloured precipitate, helping identify the metal ion present, like blue for copper.
How it works
Ammonium hydroxide can also form precipitates with metal ions, and testing for excess reagent dissolving the precipitate helps distinguish between similar ions.
Why it matters
For example, zinc hydroxide precipitate dissolves in excess NaOH (amphoteric), while iron hydroxide precipitate does not dissolve in excess.
Key detail
This systematic approach to using specific reagents and observing reactions is fundamental to qualitative analysis in analytical chemistry.
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Quick notes
• NaOH forms coloured precipitates with metal salts.
• Colour helps identify the metal ion.
• Example: blue precipitate for copper ions.
• NH4OH also forms precipitates with metal ions.
• Excess reagent test distinguishes similar ions.
• Zinc hydroxide dissolves in excess NaOH (amphoteric).
• Iron hydroxide does not dissolve in excess.
• This is fundamental to qualitative analysis.