Can alumina react with dilute sulfuric acid?

Aluminum oxide is passivated in cold concentrated sulfuric acid and concentrated nitric acid； However, it reacts in hot concentrated sulfuric acid, concentrated nitric acid, and dilute nitric acid, but does not produce hydrogen gas. ； Reacts with dilute sulfuric acid and hydrochloric acid to produce hydrogen gas.

Energy, reaction formula Al2O3+H2SO4=Al2(SO4)3+H2O

Aluminum oxide is a basic oxide. . Reacts easily with dilute sulfuric acid

Let me ask you about the second floor first.: “Reacts with dilute sulfuric acid and hydrochloric acid to produce hydrogen gas. ” Can you explain how hydrogen is generated, thank you. Also, it seems that alumina has two variants, α-type and γ-type, right? ,

I learned this reaction in junior high school, and it is theoretically possible, but I don’t know if the question mentioned by the poster contains special reaction conditions.

This is the reaction of dilute acid and amphoteric oxide! Absolutely

can react: Al2O3+3H2SO4=Al2(SO4)3+3H2O

Of course, Al2O3 is an amphoteric substance, and the reaction formula is Al2O3+3H2SO4=Al2(SO4)3+3H2O. It certainly cannot produce hydrogen with dilute sulfuric acid. I think the person on the second floor may have made a typo, but aluminum alone is fine.

Aluminum will be passivated in cold concentrated sulfuric acid, preventing further reactions. Passivation is also an oxidation reaction, producing an oxide film. His presence enveloped the planned substance, so the reaction was interrupted. Aluminum oxide and sulfuric acid react to produce aluminum sulfate and water. It is a common reaction of acid and alkaline oxides i.

Of course you can, it just won’t react with cold concentrated sulfuric acid and will not produce hydrogen (not aluminum! )

I don't know when chemistry became a purely theoretical science.

Generally speaking, alumina does not react with concentrated sulfuric acid because alumina has a dense oxide film that prevents cold sulfuric acid from reacting with it.

The poster wants to see what type of alumina it is. General alumina is easy to reflect. If it is alpha or gamma type - aluminum oxide, it is artificial corundum. It is a corrosion-resistant and high-temperature resistant material. like: Floor coatings, high-heat reactors, and more. . . Please check what kind of alumina it is.

Learn more, corundum does not react in dilute sulfuric acid.

Aluminum oxide does not react with cold concentrated sulfuric acid because a dense oxide film is formed that prevents the reaction from continuing. Dilute sulfuric acid is fine because aluminum oxide is an amphoteric oxide.

The aluminum oxide contained in the ceramics we are talking about cannot be regarded as a separate pure chemical substance aluminum oxide. The difference is still very big. I soaked the ceramics with sulfuric acid and there is no change from a macro perspective, but it is hard to say from a micro perspective!

That should be the property of metallic aluminum. How does the reaction between aluminum oxide and hydrochloric acid produce hydrogen? ! Aluminum reacts with concentrated sulfuric acid to form aluminum oxide, which causes passivation on the aluminum surface and protects the metal aluminum. So do you think alumina reacts with sulfuric acid? Aluminum oxide is divided into three types: α-Al2O3 β-Al2O3 γ-Al2O3. Among them, α-Al2O3 is corundum, and its crystal belongs to a hexagonal close-packed configuration. Due to this close-packed structure, coupled with the strong attraction between Al3+ ions and O2- ions in the crystal, the lattice energy is large, so the melting point of α-Al2O3 (2288 15K) and hardness (8.8) are very high. It is insoluble in water, acid or alkali, corrosion-resistant and electrically insulating. β-Al2O3 has ionic conductivity and γ-Al2O3 easily absorbs water and is soluble in acid

It can react under normal conditions, but some weird reactions often occur in electrode reactions, which is not clear here.

In fact, looking at the above posts, this question is basically answered correctly. What I want to emphasize here is that alumina, as an amphoteric oxide, can easily react with dilute sulfuric acid. The sulfuric acid concentration provided by the poster is 1.8 mol/L, which is obviously a dilute acid, so the answer is also obvious. In addition, what I want to say is that concentrated sulfuric acid (more than 98%) will not react with alumina. The reason is very simple. Concentrated sulfuric acid reflects its strong oxidizing property, while alumina has become an oxidized state and cannot be oxidized anymore. ::lol