1988 WAEC Chemistry Practical Aqueous solutions of zinc chloride, calcium chloride iron (lII) tetraoxosulphate (VI) and lead (II) trioxonitrate (IV) are contained...

WAEC 1988

Aqueous solutions of zinc chloride, calcium chloride iron (lII) tetraoxosulphate (VI) and lead (II) trioxonitrate (IV) are contained in four separate bottles whose labels have been lost. Using aqueous ammonia solution only, show how you would identify the content of each bottle.

Explanation

Add dil. aqueous NNH\(_3\) solution to about 2cm\(^3\) of each solution.

Observation Inference

(i) White precipitate soluble in excess NH\(_{3}\)

(ii) No visible reaction 

(iii) Reddish brown ppt. insoluble in excess NH\(_{3(aq)}\) 

(iv) White precipitate insoluble in excess NH\(_{3(aq)}\) 

 

 

Therefore ZnCl\(_2\)

It is therefore CaCl\(_2\) 

Therefore Fe\(_2\)(SO\(_2\))

Therefore Pb(NO\(_3\))\(_3\)

 


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