Search results
Results from the WOW.Com Content Network
The latter is consistent with the pK a ’s of carbonic acid: pK 1 = 6.77 and pK 2 = 9.93. To a single metal ion, carbonate is observed to bind in both unidentate (κ 1-) and bidentate (κ 2-) fashions. [5] In the covalent bond classification method, κ 1-carbonate is anX ligand and κ 2-carbonate is an X 2 ligand.
At ambient temperatures, pure carbonic acid is a stable gas. [6] There are two main methods to produce anhydrous carbonic acid: reaction of hydrogen chloride and potassium bicarbonate at 100 K in methanol and proton irradiation of pure solid carbon dioxide. [3] Chemically, it behaves as a diprotic Brønsted acid. [8] [9]
In chemistry, the term is sometimes used in place of carboxylation, which refers to the formation of carboxylic acids. In inorganic chemistry and geology, carbonation is common. Metal hydroxides (MOH) and metal oxides (M'O) react with CO 2 to give bicarbonates and carbonates: MOH + CO 2 → M(HCO 3) M'O + CO 2 → M'CO 3
Attempts to prepare some carboxylate complexes, especially for electrophilic metals, often gives oxo derivatives. Examples include the oxo-acetates of Fe(III), Mn(III), and Cr(III). Pyrolysis of metal carboxylates affords acid anhydrides and the metal oxide. This reaction explains the formation of basic zinc acetate from anhydrous zinc diacetate.
A carbonate is a salt of carbonic acid, (H 2 CO 3), [2] characterized by the presence of the carbonate ion, a polyatomic ion with the formula CO 2− 3. The word "carbonate" may also refer to a carbonate ester , an organic compound containing the carbonate group O=C(−O−) 2 .
Reacting a mixture of alkali metal carbonates and Ga 2 O 3 with H 2 S leads to the formation of thiogallates containing the [Ga 2 S 4] 2− anion. Strong acids decompose these salts, releasing H 2 S in the process. [7]: 104–105 The mercury salt, HgGa 2 S 4, can be used as a phosphor. [9]
Reacting a mixture of alkali metal carbonates and Ga 2 O 3 with H 2 S leads to the formation of thiogallates containing the [Ga 2 S 4] 2− anion. Strong acids decompose these salts, releasing H 2 S in the process. [37]: 104–105 The mercury salt, HgGa 2 S 4, can be used as a phosphor. [39]
Metal oxides which react with both acids as well as bases to produce salts and water are known as amphoteric oxides. Many metals (such as zinc , tin , lead , aluminium , and beryllium ) form amphoteric oxides or hydroxides.