1) A solution contains Pb2+ and Zn2+ ions, with nitrate as the counter ion. Cons

ID: 870746 • Letter: 1

Question

1) A solution contains Pb2+ and Zn2+ ions, with nitrate as the counter ion. Consult the solubility rules to answer the following questions.

a. NaOH is added. What precipitate (or precipitates) form(s)? ______________________________

Can you distinguish between the two metal ions using sodium hydroxide? ____Yes ____No.

b. NaI is added. What precipitate (or precipitates) form(s)? ______________________________

Can you distinguish between the two metal ions using sodium iodide? ____Yes ____No

2) A test tube contains a solution with an unknown anion. Another solution of magnesium nitrate is added to the unknown, and no precipitate forms.

What anion can it be? Circle all that apply Cl

1. a. When NaOH is added Amphoteric Hydroxides of the two ions Pb(OH)2(s) and Zn(OH)2(s) are formed as precipitates.

The two metal ions can not be distinguished using NaOH because on adding excess of sodium hydroxide both the hydroxides dissolves.

b. When NaI is added PbI2 is precipitated though ZnI2 is soluble.

The two metal ions can be distinguished as on adding NaI, only PbI2 obtained as a precipitate.

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