Testing for chlorides (Cl^-), bromides (Br^-) and iodides (I^-)
4 marks · NormalName the compounds formed when silver nitrate is added to solutions containing (i) chloride, (ii) bromide, and (iii) iodide ions.
Give the colour of each compound formed in part (a).
Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.
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(a) Silver chloride (AgCl), silver bromide (AgBr), silver iodide (AgI) · must show silver chloride, silver bromide, silver iodide
(b) White (AgCl), cream (AgBr), yellow (AgI) · must show white, cream, yellow
Common mistakes: Swapping colours between compounds.; Giving formulae instead of names when asked for names.
Show mark scheme and worked solution
Marking points
A1 (a) · 1 mark · Correctly names silver chloride (AgCl)
A2 (a) · 1 mark · Correctly names silver bromide and silver iodide
C1 (b) · 1 mark · Gives correct colours: white (AgCl), cream (AgBr), yellow (AgI)
C2 (b) · 1 mark · All three correct and in correct order
Worked solution
(a) Silver chloride, silver bromide, and silver iodide are formed.
(b) Silver chloride is white; silver bromide is cream; silver iodide is yellow.