Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Chemical compound
Perrhenic acid is the chemical compound with the formula Re2O7(H2O)2. It is obtained by evaporating aqueous solutions of Re2O7. Conventionally, perrhenic acid is considered to have the formula HReO4, and a species of this formula forms when rhenium(VII) oxide sublimes in the presence of water or steam.[2] When a solution of Re2O7 is kept for a period of months, it breaks down and crystals of HReO4·H2O are formed, which contain tetrahedral ReO−4.[3] For most purposes, perrhenic acid and rhenium(VII) oxide are used interchangeably. Rhenium can be dissolved in nitric or concentrated sulfuric acid to produce perrhenic acid.
^Glemser, O.; Müller, A.; Schwarzkopf, H. (1964). "Gasförmige Hydroxide. IX. Über ein Gasförmiges Hydroxid des Rheniums". Zeitschrift für anorganische und allgemeine Chemie (in German). 334 (1–2): 21–26. doi:10.1002/zaac.19643340105..
^Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 978-0-08-037941-8.
Perrhenicacid is the chemical compound with the formula Re2O7(H2O)2. It is obtained by evaporating aqueous solutions of Re2O7. Conventionally, perrhenic...
pH mesoperrhenate (ReO3− 5) forms. Perrhenate, like its conjugate acidperrhenicacid, features rhenium in the oxidation state of +7 with a d0 configuration...
Permanganic acid (or manganic(VII) acid) is the inorganic compound with the formula HMnO4. This strong oxoacid has been isolated as its dihydrate. It...
Roasting the ore volatilizes rhenium oxides. Rhenium(VII) oxide and perrhenicacid readily dissolve in water; they are leached from flue dusts and gasses...
Ammonium perrhenate (APR) is the ammonium salt of perrhenicacid, NH4ReO4. It is the most common form in which rhenium is traded. It is a white salt; soluble...
An oxyacid, oxoacid, or ternary acid is an acid that contains oxygen. Specifically, it is a compound that contains hydrogen, oxygen, and at least one...
examples of which include metal aquo complexes such as Fe(H 2O)2+ 6 to perrhenicacid, which contains two water molecules coordinated to a rhenium center...
It can be obtained by dissolving an excess of gadolinium oxide in a perrhenicacid solution (240 g/L) in the presence of hydrogen peroxide, from which...
pH mesoperrhenate (ReO3− 5) forms. Perrhenate, like its conjugate acidperrhenicacid, features rhenium in the oxidation state of +7 with a d0 configuration...
at high temperature affords Re 2O 7. In concentrated nitric acid, it yields perrhenicacid. Upon heating to 400 °C under vacuum, it undergoes disproportionation:...
impure product. This compound reacts with water to produce perrhenicacid and nitric acid. When heated above 75 °C, it decomposes to rhenium heptoxide...
forms. Gallium can be anodically dissolved in perrhenicacid at 50-55 °C, and dried with sulfuric acid to obtain the hydrate crystal [Ga(H2O)6(ReO4)3]·2H2O...
sulfides are oxidized a 500-700 °C in air. It dissolves in water to give perrhenicacid. Heating Re2O7 gives rhenium(IV) oxide, signalled by the appearance...
It can be obtained by reacting excess neodymium oxide with 240 g/L perrhenicacid solution. In its solution, NdReO42+ and Nd(ReO4)2+ can be observed with...
metal under sulfur hexafluoride. It hydrolyzes under a base to form perrhenicacid and hydrogen fluoride: ReF7 + 4H2O → HReO4 + 7HF With fluoride donors...
with the formula ReO3ClL2. The compound hydrolyzes readily to give perrhenicacid. The compound adopts a tetrahedral structure with Re-O and Re-Cl bond...
formula ReI 4. Rhenium tetraiodide can be obtained via the reduction of perrhenicacid with hydrogen iodide: 2HReO4 + 14HI4 → 2ReI4 + 3I2 + 8H2O Rhenium tetraiodide...
lanthanum perrhenates. Scandium perrhenate can be obtained by reacting perrhenicacid with scandium oxide. From the solution, the trihydrate of scandium perrhenate...
perrhenate can be produced by the neutralization of potassium hydroxide and perrhenicacid. K O H + H R e O 4 ⟶ K R e O 4 + H 2 O {\displaystyle \mathrm...
II. Standard Partial Molal Heat Capacities of Sodium Perrhenate and PerrhenicAcid from 0 to 100o". Journal of the American Chemical Society. 86 (24):...
oxidizing acids, such as nitric acid, concentrated sulfuric acid or aqua regia. The dark red hygroscopic substance is a strong acid, with a pKa of 0.32, as such...
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