Ion reaction, aluminum ion and hydroxide what exactly? Add ammonia water in the solution to generate white precipitation, then add excess ammonia water, precipitation does not disappear. Why is the answer given is there must be aluminum ions ah? Add excessive ammonia water, will not produce tetrahydroxyl aluminate, again, why aluminum ion and bicarbonate can not appear at the same time, how to react Ion reaction, aluminum ion and hydroxide what exactly? Add ammonia water in the solution to generate white precipitation, then add excess ammonia water, precipitation does not disappear. Why is the answer given is there must be aluminum ions ah? Add excessive ammonia water, will not produce tetrahydroxyl aluminate, also, why aluminum ion and bicarbonate can not appear at the same time, how to react Ion reaction, aluminum ion and hydroxide what exactly? Add ammonia water in the solution to generate white precipitation, then add excess ammonia water, the precipitation does not disappear. Why the answer is that there must be aluminum ions ah? Add excessive ammonia water, will not produce tetrahydroxyl aluminate, also, why aluminum ion and bicarbonate can not appear at the same time, how to react

Ion reaction, aluminum ion and hydroxide what exactly? Add ammonia water in the solution to generate white precipitation, then add excess ammonia water, precipitation does not disappear. Why is the answer given is there must be aluminum ions ah? Add excessive ammonia water, will not produce tetrahydroxyl aluminate, again, why aluminum ion and bicarbonate can not appear at the same time, how to react Ion reaction, aluminum ion and hydroxide what exactly? Add ammonia water in the solution to generate white precipitation, then add excess ammonia water, precipitation does not disappear. Why is the answer given is there must be aluminum ions ah? Add excessive ammonia water, will not produce tetrahydroxyl aluminate, also, why aluminum ion and bicarbonate can not appear at the same time, how to react Ion reaction, aluminum ion and hydroxide what exactly? Add ammonia water in the solution to generate white precipitation, then add excess ammonia water, the precipitation does not disappear. Why the answer is that there must be aluminum ions ah? Add excessive ammonia water, will not produce tetrahydroxyl aluminate, also, why aluminum ion and bicarbonate can not appear at the same time, how to react

Aluminum ions can react with alkali to form aluminum hydroxide precipitate, aluminum hydroxide can only dissolve in strong alkali, that is to say, aluminum hydroxide can only react with strong alkali to form metaluminate ion, namely tetrahydroxy aluminate ion.
The above is the basic chemical properties of aluminum ions, high school only need to master these.
Ammonia water is a weak base, and can not dissolve aluminum hydroxide. Therefore, when ammonia water is added into the solution, white precipitation will be generated. If excess ammonia water is added, the precipitation will not disappear, and aluminum ion will be contained. This is not true, and magnesium ion may also be contained. There should be other conditions.
Aluminum ion hydrolysis is acidic and bicarbonate ion hydrolysis is basic. When the two are together, the hydrolysis promotes each other and can proceed to the end, finally forming aluminum hydroxide precipitation and carbon dioxide.
Al3++3HCO3-==Al (OH)3 3CO2↑. Since there is water before and after the reaction and the quantity is equal, the ion equation is eliminated.

What is the ionic equation for the reaction of aluminum ions with excess hydroxide ions? Why? I thought it was Al3++4OH-=Al (OH)4-, but the answer is Al3++4OH-=AlO2-+2H2O, or is it just different?

Same, but generally used in high school.


Same, but the latter is widely used in high school