Advertisements
Advertisements
Question
How will you distinguish NH4OH solution from NaOH solution?
Solution
NH4OH and NaOH can be distinguished by using calcium salts.
For example, when NaOH is added to Ca(NO3)2, Ca(OH)2 is obtained as a white precipitate that is sparingly soluble in excess of NaOH.
\[\ce{Ca(NO3)2 + 2NaOH → Ca(OH)2 + 2NaNO3}\]
When NH4OH is added to calcium salts, no precipitation of Ca(OH)2 occurs, even with an excess of NH4OH. This is because the concentration of OH−ions from the ionization of NH4OH is so low that it cannot precipitate the calcium hydroxide.
APPEARS IN
RELATED QUESTIONS
What happens when ammonia solution is added first dropwise and then in excess to the following solution:
FeCl3
Write a balanced equation for this reaction.
Name the metal hydroxides which are insoluble in ammonium hydroxide solution.
Name the metal hydroxides which are soluble in ammonium hydroxide solution.
You are provided with PbCO3, ZnCO3 and CaCO3. How will you identify these cations?
How would you distinguish between Zn2+ and Pb2+ ions, using ammonium hydroxide solution?
Write the observation for the following:
NaOH is added drop-wise till in excess to a solution of zinc sulphate.
Identify the cation of the following case:
NaOH solution when added to solution (A) gives a reddish brown precipitate
Write balanced equation:
Copper sulphate solution with ammoni um hydroxide solution.
Write balanced equation:
Copper sulphate solution with ammonium hydroxide solution.
Write balanced equation:
Copper sulphate solution with ammonium hydroxide solution.
