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  2. Solubility chart - Wikipedia

    en.wikipedia.org/wiki/Solubility_chart

    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.

  3. Aqua regia - Wikipedia

    en.wikipedia.org/wiki/Aqua_regia

    Here, fresh aqua regia has been added to these NMR tubes to remove all traces of organic material. Aqua regia (/ ˈ r eɪ ɡ i ə, ˈ r iː dʒ i ə /; from Latin, "regal water" or "royal water") is a mixture of nitric acid and hydrochloric acid, optimally in a molar ratio of 1:3. [b] Aqua regia is a fuming liquid.

  4. Metal ions in aqueous solution - Wikipedia

    en.wikipedia.org/wiki/Metal_ions_in_aqueous_solution

    A metal ion in aqueous solution or aqua ion is a cation, dissolved in water, of chemical formula [M(H 2 O) n] z+.The solvation number, n, determined by a variety of experimental methods is 4 for Li + and Be 2+ and 6 for most elements in periods 3 and 4 of the periodic table.

  5. Rhodium - Wikipedia

    en.wikipedia.org/wiki/Rhodium

    Rhodium has both a higher melting point and lower density than platinum. It is not attacked by most acids: it is completely insoluble in nitric acid and dissolves slightly in aqua regia. Rhodium belongs to group 9 of the periodic table, but exhibits an atypical ground state valence electron configuration for that group.

  6. Rhodium(III) oxide - Wikipedia

    en.wikipedia.org/wiki/Rhodium(III)_oxide

    Rhodium oxide can be produced via several routes: Treating RhCl 3 with oxygen at high temperatures. [3] Rh metal powder is fused with potassium hydrogen sulfate. Adding sodium hydroxide results in hydrated rhodium oxide, which upon heating converts to Rh 2 O 3. [4] Rhodium oxide thin films can be produced by exposing Rh layer to oxygen plasma. [5]

  7. Noble metal - Wikipedia

    en.wikipedia.org/wiki/Noble_metal

    The black tarnish commonly seen on silver arises from its sensitivity to sulphur containing gases such as hydrogen sulfide: 2 Ag + H 2 S + ⁠ 1 / 2 ⁠ O 2 → Ag 2 S + H 2 O. Rayner-Canham [ 4 ] contends that, "silver is so much more chemically-reactive and has such a different chemistry, that it should not be considered as a 'noble metal'."

  8. Electrochemical coloring of metals - Wikipedia

    en.wikipedia.org/wiki/Electrochemical_coloring...

    An electrolyte of 100 g of litharge dissolved in 0.5 l of water can also be used in which 100 g of NaOH is dissolved. Becquerel used a solution of 200 parts water, 20 potassium hydroxide and 15 litharge. A. Roseleur used a much milder solution of 200 parts of water, 10 parts of potassium hydroxide and 1 part of litharge. [21]

  9. Recrystallization (chemistry) - Wikipedia

    en.wikipedia.org/wiki/Recrystallization_(chemistry)

    The solvent utilized in single-solvent recrystallization must dissolve the crude reaction mixture only when it is heated to reflux. [3] The heated solution is then passively cooled, yielding a crystallized product absent of impurities. [3] The solid crystals are then collected utilizing a filtration apparatus and the filtrate is discarded. [4]