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This is because Fe3+, Al3+ has a strong hydrolytic capacity, in fact, the pH of FeCl3, AlCl3 solution is approximately equal to 2 and 3 respectively at this pH, the pH of FeCl3 solution is approximately equal to phosphoric acid, while.
The pH of AlCl3 is approximately equal to formic acid, which means that their aqueous solution is more obviously acidic, so when carbonate is added to the system, it can be regarded as a relatively strong acid to prepare a relatively weak acid.
Later, when I saw Fe3+, I treated him as a moderately strong acid, and when I saw Al3+, I treated it as a strong acid.
and Fe2+Cu2+
zn2+mg2+
nh4+ag+
Wait. The hydrolysis of these cations is very weak, and most of them are hydrolyzed to produce hydrogen ions that are not concentrated enough to produce carbonic acid, so they will not be dihydrolyzed.
Therefore, when you see the above 6 ions in the future, you must think that they are very weak acids (after hydrolysis, they are still weaker than carbonic acid).
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It is not non-existent, it is absent in aqueous solution due to the occurrence of double hydrolysis, and it is present as a solid.
the first decomposes into aluminum hydroxide and carbon dioxide;
the second decomposes into iron hydroxide and carbon dioxide;
The third decomposes into copper hydroxide and carbon dioxide. Thank you!
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These three substances are hydrolyzed in water to form carbon dioxide, aluminum hydroxide precipitation, iron hydroxide precipitation, and copper hydroxide precipitation, respectively. So they don't exist in solution.
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Aluminum carbonate and iron carbonate will be completely hydrolyzed in water to form weak acids and bases, so they will disappear as soon as they are dissolved in water, and they do not exist in water.
Silver hydroxide is reduced to silver. The silver ammonia solution produced by silver nitrate and ammonia contains silver hydroxide ammonia, which is a weak oxidizing agent, which can oxidize acetaldehyde into acetic acid, which reacts with ammonia to form ammonia acetate, and the silver ions are reduced to metallic silver CH3CHO+2AG(NH3)2OH CH3CoonH4+2AG +3NH3+H2O (AGoh hydroxide is produced by ionization in ammonia water).
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I guess they can all exist for a short time.
But silver hydroxide easily decomposes into silver oxide.
Aluminium carbonate and iron carbonate will be double hydrolyzed to the end.
CO2 and aluminium hydroxide or iron hydroxide precipitates are generated.
So it's generally said that they don't exist anymore.
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Cu2(OH)2CO3 = (strip or fiber heating) 2CuO+CO2+H2O
As above, the decomposition products are oxidized and imitation copper, and carbon dioxide and water are destroyed.
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Solid chemicals contain deliquescent water, which condenses into small droplets on the wall of the tube when heated.
I'm a high school graduate, the teacher said so.
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If 1 is correct, the phenomenon should be (the black solid is completely dissolved, and the solution turns blue), if 3 is correct, the phenomenon should be (the black solid is partially dissolved, and the black solid that does not participate in the reaction is left standing after the complete reaction floats on the liquid surface, and the lower solution appears light blue).
After thinking about it, he thought that 3 could be ruled out on the grounds that (the carbon and copper oxide in the mixture will undergo redox reactions when heated, and eventually produce red copper and carbon dioxide gas, so if the black solid formed when heated is carbon and copper oxide, it is impossible for the two to coexist when heated).
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Aluminum carbonate and iron carbonate will be completely hydrolyzed when sold in water, forming weak vertical acid and weak base, so they will disappear as soon as they are dissolved in water, and they do not exist in water.
Qi Xian teased correctly.
It is completely double hydrolyzed.
Fe2(CO3)3+3H2O=2Fe(OH)3 +3CO2 Al2(CO3)3+3H2O=2Al(OH)3 +3CO2 Similar to Fe2S3, Al2S3, Cr2S3, etc.
Silver hydroxide is reduced to silver.
Mistake. It should be broken down into ag2o and h2o:
AgoH (H2O catalysis) Ag2O+H2O, rapid at room temperature.
In addition it is not ag(oh)2 but agoh. +2 valent AG is currently only found in AGF2.
The precipitation at the beginning of the silver mirror reaction is agoh, but it cannot be observed because the decomposition is too fast. What was seen was a tan Ag2O suspension.
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After the total decomposition of the alkaline copper carbonate is heated, three kinds of copper oxide, water and carbon dioxide are produced, and the remaining solid is only copper oxide. Copper oxide is an oxide as well as a chemical compound. The chemical equation is:
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Thermal decomposition of copper carbonate: CuCO3=CuO+CO2 If you don't understand anything about this question, you can ask it, and if you are satisfied, remember.
If you have other questions, please send them separately or click to ask me for help, it is not easy to answer the questions, please understand, thank you.
Good luck with your studies!
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Basic copper carbonate? After decomposition, it is carbon dioxide, water, copper oxide.
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