G. A solution contains one or more of the following ions: Ba +2 , Cu +2 , and Co

Question

G. A solution contains one or more of the following ions: Ba+2, Cu+2, and Co+2. When you add sodium sulfate to the solution, no precipitate forms. When you add sodium iodide, a dark precipitate forms. You filter off the precipitate and add sodium carbonate to the remaining solution, producing a cloudy precipitate. Which ions were present in the original solution? Write net ionic equations for the formation of each of the precipitates observed.

H. Lets say we have a waste container from our lab containing the following ions: Ba+2, Cu+2, and Ni+2. Based on your findings, suggest a sequence for adding the sodium solutions in such a way that we could separate each of these ions by selective precipitation. Write a net ionic equation for the formation of each precipitate.

Explanation / Answer

G

First reaction shows Cu2+
2Cu2+ + 4I- -------> 2CuI + I2

Second reaction shows Ba2+
Ba2+ + CO3 2- ------> BaCO3

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