You suspect that a water sample contains lead (II) ions and wish to test your su

ID: 905126 • Letter: Y

Question

You suspect that a water sample contains lead (II) ions and wish to test your suspicion

by carrying out an appropriate precipitation reaction using the water sample.

a) Suggest a soluble salt solution that you could add to the water sample to test for the

presence of lead(II).

b) Using the solution you suggested in part (a), what would be a positive test result for

the presence of lead (II)?

c) Write a balanced net ionic equation for the reaction that produces the positive test

result you described in part (b).

a) The soluble salt that you could add to the water sample to test for the presence of lead(II)

is potassium iodide (KI).

b) If we add potassium iodide to the lead(II) ion solution then we get yellow precipitate that is lead iodide.

Pb2+(aq) + 2KI(aq) ----> PbI2(s) + 2K+(aq)

c) Net ionic equation for the formation of lead iodide

Pb2+(aq)+ 2I-(aq) ----> PbI2(s)

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