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Why is it difficult to predict that a precipitate would form when reacting Copper II nitrate with KI?
In my lab we had an unpredicted reaction forming a precipitate between copper II nitrate and potassium iodide. In the analysis we have to explain why we could not predict this precipitate forming ahead of time. I've done some research and found out that CuI2 is unstable and decomposes into CuI and I2 when formed but I still don't know how that would help me figure out why a precipitate would form.
1 Answer
- Steve OLv 71 decade agoFavorite Answer
it would be difficult for someone that had not some research and found out that CuI2 is unstable and decomposes into CuI and I2
most Cu+2 halides are stable & soluble
such as CuBr2 & CuCl2
so one might expect that if CuI2 formed it might be stable & soluble as well
they would not have guessed that CuI2 would redox into CuI and I2
then they would have to know that many Cu+1 halides are not soluble
