There is no 1 gold acid HAuO2 2 gold base gold hydroxide Au OH3

Analysis: Gold(III) hydroxide usually refers to the yellow-brown precipitate formed by the reaction of a solution containing Au3+ (such as gold trichloride solution) with a base (such as sodium hydroxide), and its chemical formula may be . It can also be made from carbonate solutions with concentrated [aucl4]?

solution reaction obtained. Chemical formula Au(OH)3, molecular weight. Yellow-brown solid, insoluble in water.

Amphoteric hydroxides. Soluble in most acids; Soluble in excess of strong alkali solution to form complex hydroxide goldate. Soluble in concentrated acids and potassium hydroxide in hot water.

When slightly hot, it decomposes to form gold trioxide. Heat to 140 150 dehydrated into oxide gold. 250 hours to decompose into gold and oxygen.

It is easy to reduce to metallic gold. It is prepared by the reaction of gold chloride solution with sodium hydroxide solution. Under phosphorus pentoxide drying, gold(III) hydroxide forms AuO(OH).

Losing water at 140°C gives Au2O3. It is an amphoteric hydroxide that is soluble in most acids and also soluble in excess of strong alkaline solutions to form [au(oh)4]?Ion.

It is easy to reduce to metallic gold.

Preparation: Add excess sodium carbonate to potassium chloroaurate aqueous solution, heat it on a water bath for a long time, filter out the sediment, and wash and dry it thoroughly. It is prepared by the reaction of gold chloride solution with sodium hydroxide solution.

There should be no gold acid, but there is tetrachlorogold acid (HAUCL4), which can be prepared by adding aqua regia to pure gold.

Gold hydroxide must be there, and it can be prepared by adding an appropriate amount of strong alkali solution to gold trichloride, but if it is excessive, it will form a complex such as Na[Au(OH)4], which will be heated between 140 degrees Celsius and 150 degrees Celsius, and the following reaction will occur: 2Au(OH)3=Au2O3+3H2O; Heating between 160 degrees Celsius and 250 degrees Celsius will cause the following reaction: Au2O3=Au2O+O2; Heating above 250 degrees Celsius will cause the following reaction:

2au2o=4au+o2↑。It can also be formed in nature (found in Russia).

The excess sodium carbonate is added to the potassium chloroaurate water solution, placed on a water bath for a long time to heat, filter out the sediment, and fully wash and dry it. It is prepared by the reaction of gold chloride solution with sodium hydroxide solution.

Raw material for the preparation of gold oxide. It is used for gold plating, ceramic coloring, etc.

Experts from Russia's first non-ferrous and precious metal exploration and research institute believe that the chemical properties of gold are not absolutely stable, and it is possible to generate oxide and other substances in some special artificial and natural environments.

It is generally believed that it is difficult to produce oxides under natural conditions. However, in recent years, gold oxides have been discovered in Russian gold mining areas. In the Akinskoye region of Russia's Kamchatka Peninsula, scientists have discovered gold hydroxide; In the South Urals gold mines, hydroxides of gold were also found.

Russian experts pointed out that the natural formation of oxide layer on the surface of gold is a rare phenomenon in nature, and it needs to meet at least the following three conditions: 1. Although the existence of gold is different, they must all be located at the bottom of the river and rubbed by the sand and stones at the bottom of the river for many years; 2. When the river freezes in winter, the water close to the bottom of the river must be liquid, and the oxygen pressure in the water is several times higher than that when it is not frozen; 3. Rivers must freeze and melt year after year.

Gold hydroxide Au(OH)3 is a yellow-brown solid that is insoluble in water.

It is an amphoteric hydroxide that is soluble in most acids and is also soluble in excess of strong alkali solutions.

au(oh)4]

Ion. It is easy to restore and carry the gold into the gold, and the smile is a banquet and shouting gold.

Gold trioxide can be prepared by mixing gold trichloride with sodium carbonate aqueous solution and then dehydrating: 2 AuCl3 + 3 Na2CO3 + x H2O Au2O3 6 4 x H2O + 6 NaCl + 3 CO2 Luxun Au2O3 6 4 x H2O Au2O3 + x H2O Heating gold hydroxide ( ) to 140 150 °C to constant weight or neutralizing chloroauric acid with sodium carbonate at 60 °C can also obtain gold trioxide. Under the pressure of 250°C and 30MPa, anhydrous gold trioxide can be prepared by mixing and heating amorphous aqueous gold trioxide, perchloric acid and alkali metal perchlorate in a sealed quartz tube.

The hydrate of gold trioxide, also known as gold hydroxide, is a yellow-brown precipitate prepared by the reaction of an Au3+-containing solution with alkali. It is weakly acidic and can be dissolved in concentrated alkaline solutions to generate [Au(OH)4] 6 1.

First, the Au is dissolved and burned to dissolve the two posture methods: AU+HNO3+4HCl==HAUcl4+2H2O+NO or 4AU+8CN-+2H2O+O2===4AU(CN)2-+4OH-, and then the alkali is added.

Under high temperature and high pressure. with oxygen. Or react with aqua regia.

Gold(III) hydroxide generally refers to a yellow-brown precipitate formed by the reaction of an Au3+-containing solution (e.g., trivolt crude chloride solution) with a base (e.g., sodium hydroxide), and its chemical formula may be tumbling.

It is more acidic, and it is difficult to react with the residual nitrate sulfuric acid in the congregation, but it can be soluble in hydrochloric acid to form gold trichloride or chloroauric acid, and similar reactions can occur with hydrofluoric acid.

Hope it helps you o(o

Gold hydroxide Au(OH)3 is a yellow-brown solid that is insoluble in water. Modular source.

It is an amphoteric hydroxide, soluble in most acids of Dahe, and also soluble in excess of strong alkaline solutions to form [Au(OH)4] ions.

It is easy to reduce to metallic gold.

It should be possible to coordinate with HCN.

1) Gold dissolves in aqua regia.

Au+4HCl+Hno3=H[AuCl4]+NO+2H2O2:H[AuCl4] reacts with a sufficient amount of NaOH solution to form NaAUO2H[AuCl4]+5NaOH=4NaCl+NaAUO2+3H2O3:NaAUO2 and a sufficient amount of CO2 is introduced to generate Au(OH)3 precipitate NaAUO2+CO2+2H2O=Au(OH)3+NaHCO3AU(OH)3 dominant amphoterics, Soluble in excess of NaOH, so it must be so (Au has a strong tendency to form coordination compounds, so it is best not to add ammonia NH3).

Gold: Chemical Symbol: AU

Oxidation states: main au+3 other au-1, au0, au+1, au+2, au+5, au+7

Gold oxide Trivalent gold oxide, molecular formula Au2O3, hydrate molecular formula Au2O3·3H2O ; Molecular weight; Gold; Appearance: Brown powder; Storage: Dry and sealed at room temperature.

Chemical characteristics: When heated, oxygen is released to produce elemental gold. 2au2o3 = 4au + 3o2↑

Method: Gold hydroxide can be prepared by heating at high temperature. 2au(oh)3 = au2o3 + 3h2o

Chemical properties. Its chemical properties are inactive, and can only be dissolved in aqua regia Au+4HCl+Hno3=H[AuCl4]+NO+2H2O

Compounds of gold.

Gold trichloride: AUCL3

It is a maroon-red crystal, which generally exists in the form of a dimer.

Heating 2Au+3Cl2==2AuCl3 Relative atomic Mass Isotope and Radioactivity: Au-197 Period: 6

Gold (Au) is relatively stable and not easy to react with other elements.

The reason why the chemical properties of gold are very stable is that the interaction between the outermost three electrons of the gold atom is very close, the atomic volume is compressed, and the electrons are not easily seized by oxidants, and gold is the most chemically stable element except for the noble gas element.

Oxidation state:

main au+3

other au-1, au0, au+1, au+2, au+5, au+7

Gold oxide trivalent gold oxide, molecular formula Au2O3, black, hydrate molecular formula Au2O3·3H2O; Molecular weight; Gold; Appearance: Brown powder; Storage: Dry and sealed at room temperature.

Chemical characteristics: When heated, oxygen is released to produce elemental gold.

2au2o3 = 4au + 3o2↑

Method: Gold hydroxide can be prepared by heating at high temperature.

The lattice parameters of 2AU(OH)3 = AU2O3 + 3H2O are: A, B, C, and the dot group of AU2O3 is FDD2(43).

Actually, your question shouldn't say what is the difference between hydroxides and bases... The difference is big, and it doesn't really matter. It's just that hydroxides of many metals are alkaline.

What is the definition of alkali in middle school? If I'm not mistaken, does it mean that the one that can provide oh- in the reaction is called a base? Very narrow definition. For example, sodium hydride (NaH) is also a base. But you don't need to master so much ...

Back to the question: first, "is sodium hydroxide hydroxide?" Surely yes, aren't all names called "hydroxide"? What is called "hydroxide" is hydroxide.

Secondly, the substance is either an acid or an alkali. Water (H2O) can also be regarded as hydrogen hydroxide, and you can say that it is an acid or an alkali. You've said that aluminum hydroxide is amphoteric hydroxide.

Amphoteric hydroxide means that it is a base that is more acidic than him; When it comes to something more alkaline than it, it behaves acidic.

The definition of alkali is that the ionized anions are all hydroxides, hydroxides include alkalis, amphoteric hydroxides such as aluminum hydroxide, and some complex substances such as O(OH) salts.

Aluminum hydroxide is sodium hydroxide as well.

Discrimination: A base is an anion ionized in water and only oh- ions. Like Al(OH)3 cation Al Anion OH So it's NaOH The same way to conceive of a substance Na3Co(OH)3 (conceive of a substance) is to see that there is OH and think it's a base, but in fact OH is negatively charged, so it's not a base (in fact, the theorem is not interesting, there are few bases, it's good to back it, Naoh Ca(OH)2 Al(OH)3 Cu(OH)2, etc.).