You have an aqueous solution of chromium(III) nitrate that you titrate with an a

Question

You have an aqueous solution of chromium(III) nitrate that you titrate with an aqueous solution of sodium hydroxide. After a certain amount of titrant has been added, you observe a precipitate forming. You add more sodium hydroxide solution and the precipitate dissolves, leaving a solution again. What has happened?

choose one:

1)The precipitate was chromium hydroxide, which then reacted with more hydroxide to produce a soluble complex ion, Cr(OH)4?. 2)The precipitate was chromium hydroxide, which dissolved once more solution was added, forming Cr3+(aq). 3)The precipitate was sodium nitrate, which reacted with more nitrate to produce the soluble complex ion Na(NO3)2?. 4)The precipitate was sodium hydroxide, which re-dissolved in the larger volume.

Explanation / Answer

1)The precipitate was chromium hydroxide, which then reacted with more hydroxide to produce a soluble complex ion, Cr(OH)4?.

option 1 is correct

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