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The Following Table Shows the Test a Student Performed on Four Different Aqueous Solutions Which Are X, Y, Z and W. Based on the Observations Provided, Identify the Cation Present: - Chemistry

The following table shows the test 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 minimum quantity first and then in excess
A dirty white precipitate is
formed which dissolves in
excess to form a clear solution
(1)
To solution Y ammonium
hydroxide is added in the minimum quantity first and then in excess
A pale blue precipitate is
formed which dissolves in
excess to form a clear inky blue
solution.
(2)
To solution W a small quantity of sodium hydroxide solution is
added and then in excess.
A white precipitate is formed
which remains insoluble.
(3)
To a salt Z calcium hydroxide
the solution is added and then
heated.
A pungent smelling gas turning
moist red litmus paper blue is
obtained.
(4)

 

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Solution

1)Zn2+

2) Cu2+

3) Ca2+

4) `NH_4^(+)`

Concept: Coordinate Bond
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