Edited by SarMal, Sharingknowledge
Questions and Answers
Why are aqueous hydroxide ions used to test for cations?
I know the results but I need to know why the hydroxide ions SPECIFICALLY are used
This is a bit of a complicated answer. For transition metals, a ligand exchange reaction is needed in order to properly test and identify cations. When sodium hydroxide is used to test cations, it engages and reacts with metal aquo complex. This interaction then requires the sodium hydroxide to replace one or more of the ligands. Once the sodium hydroxide has replaced the ligand, metal hydroxide is formed. Hydroxides of metals other than group 1 metals are insoluble and form precipitates.This also explains why the hydroxides of non-transition metals appear without color.
Referencing this Article
If you need to reference this article in your work, you can copy-paste the following depending on your required format:
APA (American Psychological Association)
Why are aqueous hydroxide ions used to test for cations? . (2017). In ScienceAid. Retrieved Feb 17, 2019, from https://scienceaid.net/Why_are_aqueous_hydroxide_ions_used_to_test_for_cations
MLA (Modern Language Association) " Why are aqueous hydroxide ions used to test for cations? ." ScienceAid, scienceaid.net/Why_are_aqueous_hydroxide_ions_used_to_test_for_cations Accessed 17 Feb 2019.
Chicago / Turabian ScienceAid.net. " Why are aqueous hydroxide ions used to test for cations? ." Accessed Feb 17, 2019. https://scienceaid.net/Why_are_aqueous_hydroxide_ions_used_to_test_for_cations.
Categories : Applied
Recent edits by: SarMal