Making insoluble salts
3 marks · EasyA student wants to prepare a sample of insoluble silver iodide by mixing solutions of two soluble salts.
Name a suitable silver salt solution and a suitable iodide salt solution the student could use.
State the colour of the precipitate formed.
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 nitrate and potassium iodide (or sodium iodide)
(b) yellow
Common mistakes: Choosing insoluble salts as reagents; Incorrect precipitate colour
Show mark scheme and worked solution
Marking points
B1 (a) · 1 mark · For naming an appropriate soluble silver salt (e.g. silver nitrate).
B2 (a) · 1 mark · For naming an appropriate soluble iodide salt (e.g. potassium iodide or sodium iodide).
B3 (b) · 1 mark · For stating yellow as the colour of the precipitate.
Worked solution
a) The student could mix solutions of silver nitrate and potassium iodide to make silver iodide.
b) The precipitate of silver iodide is yellow.