Potassium iodide is added to a solution of lead nitrate....what are...?

"A. The solid product of reaction?"
"B. The colour of this product?"
"C. A stoichiometric equation to represent the reaction?"
"D. Can the reaction be described as a solubility equilibrium?"

1 Answer
Jul 1, 2017

I presume you mean potassium iodide, KI.....is added to the aqueous lead salt.

Explanation:

A. "Lead iodide"

B. "Lead iodide" gives a beautiful, bright yellow precipitate......

C. Pb(NO_3)_2(aq) + 2KI(aq) rarr PbI_2(s)darr+ 2KNO_3(aq)

The net ionic equation is........

Pb^(2+) + 2I^(-) rarr PbI_2(s)darr

D. This is a "solubility equilibrium", where the salt PbI_2 is highly insoluble. I suppose you could also call it a "metathesis" or "partner exchange" reaction........but I do not know what your syllabus specifies.....Experimentally, we KNOW that all halides are soluble, EXCEPT for those of Hg_2^(2+), Pb^(2+), and Ag^+. In the 1st year curriculum, this must simply be known.

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