There is a response of H2SO4 involvement in high school

Hydrogen ions participate in the reaction.

Generation of baso4.

If there is more, there will be a lot of organic, esterification, alcohol elimination, etc.

Substances that can react with dilute sulfuric acid.

1.It can react with litmus and other indicators.

It can react with active metals such as zinc and iron.

3.Can with. Metal oxides.

reactions, such as cuo

4.It can react with alkalis, such as NaOH

5.Reacts with certain salts: such as bacl2, carbonates.

Substances that can react with concentrated sulfuric acid:

Reductive cu, H2S, S, etc.

Iron does not divide much in the case of dilute sulfuric acid, Fe+H2SO4==FeSo4+H2 reacts with concentrated sulfuric acid:

Iron in small amount: 2Fe + 6H2SO4 (concentrated) = = Heating = Fe2 (SO4) 3 + 3SO2 + 3H2O

Iron excess: Fe+2H2SO4 (concentrated)==Heating==FeSo4+SO2 +2H2O

It is important to note that iron does not react with concentrated sulfuric acid at room temperature because it passivates.

Iron and dilute sulfuric acid form ferrous sulfate and hydrogen, which do not reflect with concentrated sulfuric acid at room temperature, and react under the condition of passivation and heating to generate sulfur dioxide and ferrous sulfate!

s+o2 = so2；(Ignite).

2 so2 + o2 = 2 so3；(Catalyst heating reversible) SO3 + H2O = H2SO4

H2SO4 = SO3 + H2O( Sulfuric acid is not easy to volatilize at room temperature and when heated. But when heated to the boiling point, it decomposes into sulfur trioxide vapor and water vapor).

Chemical properties of H2SO4:

1. Discolor the indicator: Makes the purple litmus solution red.

2. It can react with alkali to form salt and water

h2so42naoh

na2so4

2h2oh2so4

ba(oh)2

BaSO4 (precipitate).

2H2O3 can react with certain salts to form new acids and salts

h2so4na2co3

na2so4

H2OCo2 (gas).

h2so42nahco3

na2so4

2H2O2CO2 (gas).

4. It can react with more active metals to form H2:Fe+

h2so4=feso4

H2 (gas) Zn+

h2so4=znso4

H2 (gas).

5. It can react with metal oxides to form salt and water

h2so4cuo

cuso4h2ofe2o3

3h2so4

fe2(so4)3

3h2o

When O2 is insufficient: 2(H2S)+O2=2(H2O)+2S; When O2 is excessive: 2 (H2S) + 3 (O3) = 2 (H2O) + 2 (SO2).

Combine the two equations above.

70mlH2S and 90mlo2 in standard state.

Under the mixing and ignition, the auspicious circle will return to the standard sensitive age after a complete reaction, and SO255ml can be obtained

Question Answer: B

Test question analysis: Analysis: Use the knowledge of chemical reactions learned combined with the occurrence conditions of metathesis reactions, and combine the given substances in pairs to find the number of reactions to solve the problem Because the activity of iron is greater than that of hydrogen and greater than copper, iron can react with dilute sulfuric acid and copper chloride, sulfuric acid can neutralize with sodium hydroxide, but not with copper chloride, sodium hydroxide can react with copper chloride because the product contains hydroxide cracking shed copper, sulfuric acid reacts with cover source hidden iron oxide, so a total of 5 reactions can occur between the four substances; Answer:

Because the Fe powder hall can have a chemical reaction with CuCl2 solution and dilute H2SO4, there are two reactions; There are two dilute H2SO4 that can react chemically with NaOH solution and Fe2O3; CuCl2 solution can chemically react with NaOH solution, then there is one; Then the two are mixed, and a total of 5 reactions occur, so choose b Comments: This question is an examination of the reaction between substances, and the key to solving the problem is to understand the properties of each substance, and at the same time, it is also necessary to judge the occurrence conditions of the metathesis reaction and the reaction law of the metal and salt solution Students should be familiar with the properties of substances, clarify the different types of reactions that occur in different substances and use the judgment reactions to solve them, and the difficulty of the question is medium