Qualitative Analysis - Result Question 10

####10. A solution when diluted with H2O and boiled, it gives a white precipitate. On addition of excess NH4Cl/NH4OH, the volume of precipitate decreases leaving behind a white gelatinous precipitate. Identify the precipitate which dissolves in NH4OH/NH4Cl.

(a) Zn(OH)2

(b) Al(OH)3

(c) Mg(OH)2

(d) Ca(OH)2

(2006, 3M)

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Solution:

  1. Zn2++2H2OZn(OH)2 White +2H+


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