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Metaaluminic acid is also aluminum hydroxide, so it is weakly reduced.
The answer to this can be found on page 545 of the second volume of the textbook "Inorganic Chemistry", which says: "Al(OH)3 is slightly more basic than acidic.
Metaaluminic acid is a weak acid, an acid that is weaker acidic than carbonic acid.
Because it can react with strong acids, strong acids have strong oxidation, so metaaluminic acid is reducing, and metaaluminic acid can ionize hydrogen ions, so metaaluminic acid is a weak acid.
Cannot react with CO2. But if it's a metaaluminate solution, it's fine. Because metaaluminic acid is less acidic than carbonic acid, it is equivalent to the replacement of weak acid by strong acid, (taking sodium metaaluminate as an example) to generate sodium carbonate and aluminum hydroxide precipitation, and if CO2 is excessive, sodium bicarbonate and aluminum hydroxide precipitation will be generated.
Metaaluminate can be the addition of excess hydrogen ions to form trivalent aluminum ions.
alo2-4h+
al3+2h2o
alo2-h+
h2o==al(oh)3↓
al(oh)3+3h+==al3+
3h20al(oh)3
It can be regarded as a single weak acid or a ternary weak base, for the following reasons.
al(oh)33hal
3h2oal(oh)3
ohalo2
2H2O can be regarded as the reaction of a ternary weak base with an acid, and a single weak acid with a base.
Note: The reason why it is said weak is because it is all weakly ionized. The compound is an amphoteric compound.
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Modern science no longer acknowledges the existence of metaaluminic acid, because it really does not exist in this way. In fact, tetrahydroxyaluminic acid, i.e., HAL[OH]4. In fact, it is aluminic acid (that is, aluminum hydroxide) that combines a water, which is a weak acid, an acid that is weaker than carbonic acid.
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Properties: white amorphous crystalline powder, hygroscopic.
Density (g ml, 25):
Melting point (c): 1800.
Refractive index (n20 d): .
Solubility: soluble in water, insoluble in ethanol.
Common chemicals, white, odorless, tasteless, strong alkaline solid. It is widely used in civil engineering, petrochemical industry, water treatment and other aspects.
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Metaaluminic acid. That is, halo2, also known as tetrahydroxyaluminic acid, that is, HAL[OH]4, tetrahydroxyaluminic acid can be regarded as metaaluminic acid plus 2 water. Metaaluminic acid is a weak acid, an acid that is weaker acidic than carbonic acid.
Metaaluminic acid and tetrahydroxyaluminic acid are actually two compounds, but they are considered by the textbook to be an old discovery error. In fact, they have different compositions and structures.
Chemical reaction..
Cannot react with CO2. But if it's a metaaluminate solution, it's fine. Because metaaluminic acid is less acidic than carbonic acid, it is equivalent to the replacement of weak acid by strong acid, (taking sodium metaaluminate as an example) to generate sodium carbonate and aluminum hydroxide precipitation, and if CO2 is excessive, sodium bicarbonate and aluminum hydroxide precipitation will be generated.
Metaaluminate can react with excess hydrogen ions (strong acids) to form trivalent aluminum ions.
alo2- +4h+ =al3+ +2h2o
alo2- +h+ +h2o =al(oh)3↓
al(oh)3 +3h+ =al3+ +3h20
Al(OH)3 can be regarded as a monobasic weak acid or a ternary weak base for the following reasons:
al(oh)3 + 3h+ =al3+ +3h2o
al(oh)3 + oh- =alo2- +2h2o
Therefore, it can be regarded as the reaction of the ternary weak base with the acid, and the reaction of the monobasic weak acid with the base.
Note: The reason why it is said weak is because it is all weakly ionized. The compound is an amphoteric compound.
Al(OH)3 is a very weak electrolyte, Al3+ and AlO2- do not coexist in aqueous solution, and double hydrolysis occurs, and the products are both Al(OH)3
al3+ +3alo2- +6h2o ═ 4al(oh)3↓
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Metaaluminic acid is an oxide of aluminum, and its chemical formula is Al2O3. It is an inorganic compound, and the common names are alumina, alumina source powder, etc. Metaaluminic acid is a white solid powder that is widely found in minerals in nature, such as mullite, corundum, etc.
Due to its high hardness, high melting point and good chemical stability, metaaluminic acid has a wide range of applications in industry, such as the preparation of ceramics, glass, enamel, refractory materials, abrasives, etc.
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Metaaluminate refers to the salt containing the "alo-" group, which is the product of the reaction of aluminum and its oxides with a base.
1.Metaaluminate solution undergoes a hydrolysis reaction, and the solution is alkaline. alo2- +2h2o ==al(oh)3 +oh-
2.Metaaluminate reacts with acid.
Reaction with strong acids: Moderate amount of strong acids: AlO2- +H+ H2O==Al(OH)3
Excess strong acid: alo2- +4h+ ==al3+ +2h2o
Reacts with weak acid (H2CO3): that is, CO2 gas is introduced.
Appropriate amount of CO2: 2alo2- +CO2+3H2O==2Al(OH)3 + CO32-
Excess CO2: AlO2- +CO2+2H2O==Al(OH)3 +HCO3-
3.The aluminum salt reacts with the metaaluminate solution.
al3+ +3alo2- +6h2o==4al(oh)3
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Contains metaaluminate ions, can be hydrolyzed, and can have a stronger acid reaction than metaaluminic acid
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1 Metaaluminate cannot exist in large quantities under acidic conditions because it will combine to form metaaluminic acid, which is a weak acid2HCO3- (H2O+AlO2-+HCO3-==Al(OH)3 "precipitation" + CO3-)
3 Al3+ (Al3+ +3alo2- +6H2O==4Al(OH)3 "precipitation").
4Fe3+ (dihydrolyzed).
5 h+ (formation of weak acid metaaluminic acid).
That's all you need to master in high school The first two equations mainly appear in inorganic inference problems Pay attention to grasp which one is too much to propose, and if you are careful, it should be no problem I hope it will help you.
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In an acidic solution, a white precipitate is produced Alo2- +H+ +H2O==Al(OH)3 (AlO2- ,H+ both cannot coexist in solution) Alo2- and OH- can coexist in solution. If a solution containing metaaluminic acid and ions is dropped into the acid solution, a white precipitate will be seen and will disappear immediately, and a large amount of Al(OH)3 will be generated
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Take sodium metaaluminate as an example.
2 Naalo + CO (small amount) + 3 H O ==== 2 Al(OH) Na Co
Naalo + HCl (a small amount) + HO ====Al(OH) NaCl
3naalo₂+alcl3+6h2o====4al(oh)3↓+3nacl
You can only write so much on your phone.
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From the principle of strong acid to weak acid, it can be seen that the acidity of carbonic acid is stronger than that of metaaluminic acid.
Carbonic acid is a binary weak acid with very small ionization constants. However, it is also considered to be a moderately strong acid, because its acidity is similar to that of phosphoric acid according to the judgment formula of the acidity of inorganic acid.
Metaaluminic acid, also known as tetrahydroxyaluminic acid, can be regarded as metaaluminic acid plus 2 water. Metaaluminic acid is a weak acid that is weaker acidic than carbonic acid and cannot react with CO2. Because the acidity of metaaluminic acid is weaker than that of carbonated carbonate, it is equivalent to the replacement of weak acid with strong acid, generating sodium carbonate and aluminum hydroxide precipitation, and if CO2 is excessive, sodium bicarbonate and aluminum hydroxide precipitation will be generated.
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It's not the same thing.
Metaaluminic acid, also known as tetrahydroxyaluminic acid, i.e. hal[OH], tetrahydroxyaluminic acid can be regarded as metaaluminic acid plus 2 water. Metaaluminic acid is a weak acid, an acid that is weaker acidic than carbonic acid.
Metaaluminic acid and tetrahydroxyaluminic acid are actually two compounds, but high school textbooks consider them old discovery errors. In fact, they have different compositions and structures.
Aluminum hydroxide, with the chemical formula Al(OH), is a hydroxide of aluminum. Aluminum hydroxide can react with acids to form salts and water as well as strong bases to form salts and water, so it is an amphoteric hydroxide.
Because it is acidic, it can also be called aluminum acid (Halo). However, when it actually reacts with a base, it is tetrahydroxyaluminate ([Al(OH)], so it is usually regarded as metaaluminic acid monohydrate (halo·h o), which is divided into two types: industrial grade and pharmaceutical grade according to its use.
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These two are not the same thing, aluminum hydroxide is amphoteric and can react with both acids and bases. It reacts with sodium hydroxide to form sodium metaaluminate, which reacts with acid to dissolve to form the corresponding salt.
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"Al(OH)3 is slightly more alkaline than acidic. "However, Al(OH)3 is aluminum hydroxide, metaaluminic acid can be regarded as the dehydrated product of aluminum hydroxide, and the acidity of most inorganic acids after dehydration is generally stronger than that of original acid (for example, pyrophosphate is more acidic than phosphoric acid).
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Metaaluminic acid does not exist in nature, only metaaluminate, and sodium metaaluminate is added to acid to form aluminum hydroxide. Stronger acids will continue to react to produce salts, such as sodium chloride. Aluminum hydroxide is an amphoteric hydroxide that can react with acids to form salts, and can also react with bases such as sodium hydroxide to form sodium metaaluminate.
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Metaaluminic acid can exist alone, and it only has the corresponding metaaluminate.
- Aluminic acid (aluminum hydroxide.
Thermal decomposition can not be used to obtain aluminic acid, what is obtained is alumina.
Aluminum hydroxide exists in acid ionization and base ionization:
h+..alo2-..h2o..=al(oh)3..=al3+..3oh-
- Metaaluminate ions are formed in acid ionization, which means that when aluminum hydroxide encounters a base, metaaluminate is formed instead of aluminum salt.
- According to acid ionization, metaaluminic acid can be seen as aluminum hydroxide removing a watery bright molecule.
after the product.
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It's not the same thing.
Metaaluminic acid, also known as tetrahydroxyaluminic acid, i.e. hal[OH], tetrahydroxyaluminic acid can be regarded as metaaluminic acid plus 2 water. Metaaluminic acid is a weak acid, an acid that is weaker acidic than carbonic acid.
Metaaluminic acid and tetrahydroxyaluminic acid are actually two compounds, but high school textbooks think they are old discovery errors. In fact, they have different compositions and structures.
Aluminum hydroxide, with the chemical formula Al(OH), is a hydroxide of aluminum. Aluminum hydroxide can react with acid to form salt and water, and can react with strong alkali to form salt and water, so it is an amphoteric hydroxide.
Because it is acidic, it can also be called aluminum acid (Halo). However, when it actually reacts with a base, it is tetrahydroxyaluminate ([Al(OH)], so it is usually regarded as metaaluminic acid monohydrate (halo·h o), which is divided into two types: industrial grade and pharmaceutical grade according to its use.
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