By drawing an electron dot diagram show the formation of Ammonium ion.
[Atomic No.: N =7 and H = 1]
State your observations when ammonium hydroxide solution is added drop by drop and then in excess to each of the following solutions:
i) Copper sulphate solution
ii) Zinc sulphate solution.
i) When NH4OH is added to copper sulphate solution drop-wise, a pale blue ppt. is obtained.
CuSO4 +2NH4OH ---> Cu(OH)2 +(NH4)2SO4 +4H2O
With an excess of NH4OH, the ppt. dissolves to give a deep blue solution of tetraamine copper(II)sulphate.
Cu(OH)2 +(NH4)2SO4 +2NH4OH --> [Cu(NH3)4)SO4 +H2O
ii) When NH4OH is added to zinc sulphate solution drop-wise, a white, gelatinous ppt. is obtained.
ZnSO4 +2NH4OH --> Zn(OH)2 + (NH4)2SO4
With an excess of NH4OH, the ppt. dissolves to give a colourless solution of tetraamine zinc(II)sulphate.
Zn(OH)2 +(NH4)2SO4 +2NH4OH --> [Zn(NH3)4]SO4 +4H2O
Name the gas evolved when the following mixtures are heated:
(i) Calcium hydroxide and Ammonium Chloride
(ii) Sodium Nitrite and Ammonium Chloride.
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