You have an aqueous solution of chromium(III) nitrate thatyou titrate with an aqueous solution of sodium hydroxide.After a certain amount of titrant has been added, you observe aprecipitate forming. You add more sodium hydroxide solutionand the precipitate dissolves, leaving a solution again. Whathas happened? (a) The precipitate was sodium hydroxide,which redissolved in the larger volume. (b) The precipitate waschromium hydroxide, which dissolved once more solution wasadded, forming Cr3 + (aq). (c) The precipitate was chromiumhydroxide, which then reacted with more hydroxide to producea soluble complex ion, Cr(OH)4-(aq). (d) The precipitatewas sodium nitrate, which reacted with more nitrate to producethe soluble complex ion Na(NO3)32 -(aq).

Chemistry
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Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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Chapter1: Chemical Foundations
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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? (a) The precipitate was sodium hydroxide,
which redissolved in the larger volume. (b) The precipitate was
chromium hydroxide, which dissolved once more solution was
added, forming Cr3 + (aq). (c) The precipitate was chromium
hydroxide, which then reacted with more hydroxide to produce
a soluble complex ion, Cr(OH)4-(aq). (d) The precipitate
was sodium nitrate, which reacted with more nitrate to produce
the soluble complex ion Na(NO3)32 -(aq).

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