Advertisements
Advertisements
प्रश्न
State your observations when ammonium hydroxide solution is added drop by drop and then in excess to the following solution:
Copper sulphate solution
Advertisements
उत्तर
When NH4OH is added to copper sulphate solution drop-wise, a pale blue ppt. is obtained.
\[\ce{\underset{(Blue)}{CuSO4} + 2NH4OH -> \underset{(Pale blue ppt)}{Cu(OH)2\downarrow} + (NH4)2SO4}\]
With the excess of NH4OH, the ppt. dissolves to give a deep blue solution of tetraamine copper(II)sulphate
\[\ce{Cu(OH)2 + (NH4)2SO4 + \underset{(In excess)}{2NH4OH} -> \underset{(Deep blue solution)}{\underset{Tetrammine copper (II) sulphate}{[Cu(NH3)4]SO4}} + 4H2O}\]
APPEARS IN
संबंधित प्रश्न
On adding dilute ammonia solution to a colourless solution of a salt, a white gelatinous precipitate appears. This precipitate however dissolves on addition of excess of ammonia solution. Identify (choose from Na, Al, Zn, Pb, Fe)
Which metal salt solution was used?
How will you distinguish NH4OH solution from NaOH solution?
Write the observation, and balanced equation for the following reaction:
Excess of ammonium hydroxide is added to a substance, obtained by adding hydrochloric acid to silver nitrate solution.
Distinguish between the given pair of compounds using the test given within brackets:
A lead salt and a zinc salt (using excess ammonium hydroxide)
How would you distinguish between Zn2+ and Pb2+ using ammonium hydroxide solution?
The following table shows the tests a student performed on four different aqueous solutions which are X,Y,Z and W. Based on the observations provided, Identify the cation present
|
Chemical Test |
Observation | Conclusion |
| To Solution X, ammonium hydroxide is added in minium quantity first and then in excess | A dirty white precipitate is formed which dissolves in excess to form a clear solution | (i) |
| To Solution Y, ammonium hydroxide is added in minimum quantity first and then in excess | A pale blue precipitate is formed which dissolves in excess to form a clear inky blue solution | (ii) |
| To solution W, A small quantity of sodium hydroxide solution is added and then in excess | A white precipitate is formed which remains insoluble | (iii) |
| To a salt Z, calcium hydroxide solution is added and then heated | A pungent smelling gas turning moist red litmus paper blue is obtained | (iv) |
Write balanced equation:
Copper sulphate solution with ammonium hydroxide solution.
Write balanced equation:
Copper sulphate solution with ammonium hydroxide solution.
A ______ coloured precipitate is formed when ammonium hydroxide is added to a solution of ferrous chloride.
Write balanced equation:
Copper sulphate solution with ammonium hydroxide solution.
