Qualitative Analysis Revision Structured Question

QE Structured Q.PNG

(ai)    Write the chemical formula for A, B, C and M.

A:

B:

C:

M:

 

(ii)    Give the ionic equation, including the state symbols, for the formation of the dirty green precipitate.

 

(b)    A colourless solution is suspected to contain either aluminium or lead(II) ions.

Describe a chemical test which can be used to identify the metal ions
present in the colourless solution and describe the expected observations.

 

 

 

 




Answer:

(a)(i) A: H2SO4
B: Na2SO4
C: Fe(OH)3
M: Fe

(ii) Fe2+(aq) + 2OH(aq) –> Fe(OH)2(s)

(b) Add hydrochloric acid/ sulfuric acid/ aq. potassium iodide. / any aqueous solution           of chloride or sulfate. Hydrochloric acid/sulfuric acid: white ppt forms if lead(II) ion       present; no visible reaction for aluminium ion. Aq. potassium iodide: yellow ppt             forms if lead(II) ion present; no visible reaction for aluminium ion.

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Author: matharena

Math Educator

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