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The precipitation of indium hydroxide was a step in the separation of indium from zincblende ore by Reich and Richter, the discoverers of indium. [6] Indium(III) hydroxide is amphoteric, like gallium(III) hydroxide (Ga(OH) 3) and aluminium hydroxide (Al(OH) 3), but is much less acidic than gallium hydroxide (Ga(OH) 3), [5] having a lower ...
Indium reacts with water to reproduce soluble indium(III) hydroxide, which is also amphoteric; with alkalis to produce indates(III); and with acids to produce indium(III) salts: In(OH) 3 + 3 HCl → InCl 3 + 3 H 2 O. The analogous sesqui-chalcogenides with sulfur, selenium, and tellurium are also known. [39] Indium forms the expected trihalides.
A flame test involves introducing a sample of the element or compound to a hot, non-luminous flame and observing the color of the flame that results. [4] The compound can be made into a paste with concentrated hydrochloric acid, as metal halides , being volatile, give better results. [ 5 ]
Bulk samples can be prepared by heating indium(III) hydroxide or the nitrate, carbonate or sulfate. [9] Thin films of indium oxide can be prepared by sputtering of indium targets in an argon/oxygen atmosphere. They can be used as diffusion barriers ("barrier metals") in semiconductors, e.g. to inhibit diffusion between aluminium and silicon. [10]
Bismuth hydroxide–BiH 3 O 3 [128] Bismuth(III) iodide–BiI 3 [129] ... Indium(III) selenide – In 2 Se 3; Indium(III) sulfide – In 2 S 3; Trimethylindium – In ...
The following chart shows the solubility of various ionic compounds in water at 1 atm pressure and room temperature (approx. 25 °C, 298.15 K). "Soluble" means the ionic compound doesn't precipitate, while "slightly soluble" and "insoluble" mean that a solid will precipitate; "slightly soluble" compounds like calcium sulfate may require heat to precipitate.
The Chen-Kao test is performed by creating an acidic solution of the compound to be tested and adding dilute Copper (II) Sulfate and Sodium hydroxide solutions. The procedure is as follows: Place small amount of material to be tested on a spot plate. Add 2 drops of reagent A; Add 2 drops of reagent B; Add 2 drops of reagent C
A solution or suspension of calcium hydroxide is known as limewater and can be used to test for the weak acid carbon dioxide. The reaction Ca(OH) 2 + CO 2 ⇌ Ca 2+ + HCO − 3 + OH − illustrates the basicity of calcium hydroxide. Soda lime, which is a mixture of the strong bases NaOH and KOH with Ca(OH) 2, is used as a CO 2 absorbent.