Answered: You have an aqueous solution of…

Introductory Chemistry: A Foundation

9th Edition

ISBN:9781337399425

Author:Steven S. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Donald J. DeCoste

Chapter15: Solutions

Section: Chapter Questions

Problem 68QAP: 68. Aluminum ion may be precipitated from aqueous solution by addition of hydroxide ion, forming...

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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? (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 Cr^{3 +} (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)₃^{2 -}(aq).

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