Hydrogen helps solve the solution of iron sulphate and aluminum sulphate separation, 10

Note that it is a separation, and the operation is more complicated. (If it is a solid, it is necessary to prepare a solution first) 1: add excess NaOH, filter, to obtain Fe(OH)3 precipitate, add an appropriate amount of sulfuric acid to the precipitate, so that the solid is just dissolved, and the iron sulfate solution is obtained (if the original mixture is solid, the solution should be evaporated and crystallized).

2: Inject a sufficient amount of CO2 into the filtrate in 1 to obtain Al(OH)3 precipitate, filter, and add an appropriate amount of sulfuric acid to the filter residue to dissolve the solid just to obtain an aluminum sulfate solution (if the original mixture is solid, the solution should be evaporated and crystallized). OK!!

To separate a substance, first consider the similarity and particularity of the substance being separated:

1. Similarity: they are all sulfates: [iron sulfate: Fe2(SO4)3, aluminum sulfate: Al2(SO4)3], with the same sulfate ions, the difference is that the cations are different.

2. When separating, it is necessary to make full use of their differences and find out their particularities

Fe3+ and Al3+ will precipitate when encountering strong alkalis, and if there is too much Al3+ in strong alkalis, they will completely dissolve. The principle is:

Fe3+ +3OH— Fe(OH)3 precipitate.

Al3+ +3OH— Al(OH)3 precipitates Al(OH)3 +OH— AlO2— +2H2O

The method is: (1) add excess NaOH and filter, (2) add excess sulfuric acid to the filtrate to obtain aluminum sulfate.

Principle: alo2— +4h+ = al3+ +2h2o

3. Dissolve the filter residue in an appropriate amount of sulfuric acid to obtain iron sulfate.

With the addition of excessive NaOH, the aluminum sulfate is deep and dissolved, and Al(OH)4- is separated, leaving Fe(OH)3 insoluble. Filter out, filter out the iron hydroxide, and then add sulfuric acid, that is, it becomes iron sulfate.

Similarly, in the separation of Al(OH)4-, sulfuric acid is also added, that is, it becomes aluminum sulfate.

The chemical equation is: 2Al(OH)3+3H2SO4=AL2(SO4)3+6H2O

Ion equation: Al(OH)3+3H+=Al3+ +3H2O

2al(oh)3 + 3h2so4= 2al2(so4)3+ 6h2o

Al(OH)3+3H+=Al3+ +3H2O Experimental phenomenon: white aluminum hydroxide solid dissolves to form a colorless solution.

Reaction type: metathesis reaction or neutralization reaction.

Aluminum sulfate Al2(SO4)3 and water H20.

2Al(OH)3 + 3H2SO4 == Al2(SO4)3 + 6H2O, which generates aluminum sulfate and water, belongs to metathesis reaction, neutralization reaction.

Acid-base neutralization reaction:

The chemical equation is: 2Al(OH)3+3H2SO4=AL2(SO4)3+6H2O

Ion equation: Al(OH)3+3H+=Al3+ +3H2O

Reaction of aluminum hydroxide and collapsing sulfuric acid:

Chemical formula: Two molecules of aluminum hydroxide and three molecules of sulfuric acid react to form one molecule of aluminum sulfate and six molecules of water; Ionic formula: one molecule of aluminum hydroxide and three molecules of hydrogen ions react to generate one retrapper aluminum ion and three molecules of water; Experimental Phenomena:

The white hydroxide leakage aluminum solid dissolves to form a colorless solution; Reaction type: metathesis reaction or acid-base neutralization reaction.

Because the excess sodium hydroxide will react with the produced aluminum hydroxide to form sodium metaaluminate, the ion equation for the reaction of sodium hydroxide and aluminum hydroxide is: Al(OH)3 +OH- =ALO2- +2H20, and its chemical equation is: NAOH+AL(OH)3=Naalo2+H2O.

The chemical formula of sodium hydroxide is NaOH and sodium hydroxide is an alkaline hydroxide. The chemical formula of aluminum hydroxide is Al(OH)3 and aluminum hydroxide is amphoteric hydroxide. Hydrogen transport simple alumina under alkaline conditions to isomerize reaction to form aluminic acid, aluminum stuffy acid will be further decomposed into water and metaaluminic acid, metaaluminic acid will be neutralized with sodium hydroxide, so sodium hydroxide can have a chemical reaction with aluminum hydroxide, and generate sodium metaaluminate and water.

Side pants.

Aluminum hydroxide and dilute sulfuric acid react to form aluminum sulfate and water, and the reaction equation is: 2Al(OH)3 + 3H2SO4 = Al2(SO4)3 + 6H2O.

Reaction equation of aluminum hydroxide and dilute sulfuric acid.

Aluminum hydroxide is a hydroxide of aluminum, with the chemical formula Al(OH)3. Aluminum hydroxide can react with acids to form salts and water and strong bases to form salts and water, so it is also an amphoteric hydroxide. Dilute sulfuric acid refers to an aqueous solution of sulfuric acid with a solute mass fraction less than or equal to 70%, and under the action of water molecules, sulfuric acid molecules ionize to form freely moving hydrogen ions (H+) and sulfate ions (SO42-).

Because the sulfuric acid molecules in dilute sulfuric acid have been completely ionized, dilute sulfuric acid does not have the special chemical properties of concentrated sulfuric acid, such as strong oxidation, water absorption, and dehydration.

Reaction equation of aluminum hydroxide and dilute sulfuric acid.

Experimental phenomenon of the reaction of aluminum hydroxide and dilute sulfuric acid: the white aluminum hydroxide solid dissolves to form a colorless solution. Chemical Formula:

Two molecules of aluminum hydroxide and three molecules of sulfuric acid react to produce one molecule of aluminum sulfate and six molecules of water. Ionic formula: One molecule of aluminum hydroxide and three molecules of hydrogen ions react to produce one molecule of aluminum ions and three molecules of water.

Metathesis should be reversed to generate sulfuric acid and water. Exothermic.

Chemistry: 3H2SO4 +2Al(OH)3 ==Al2(SO4)3 + 6H2O

Ionic ants: Al(OH)3+3H+ =Al3+ +3H2O

The hydrolysis of aluminum sulfate is incomplete, and the hydrolysate products are sulfuric acid and aluminum hydroxide, in fact, aluminum sulfate cannot react with water to obtain these two substances.

Hydrolysis produces weak acids and weak bases", this sentence is incorrect.

Only weak acids and weak alkali salts can undergo double hydrolysis reaction with water to obtain the corresponding weak acid and weak base, and the reason for complete hydrolysis is that the hydrolysis constant is large enough.

Aluminum sulfate is a weak acid and alkali salt.

2al3+ +3s2- +6h20=2al(oh)3 + 3h2s

Alum. Chemical Formula:

KAL(SO4)2·12H2O,Al3+ is very tolerant of eggplant orange as easy to tremble and hydrolyze, forming gelatinous.

Aluminum hydroxide. al(oh)3

al3+3h2o

Al(OH)3 (colloidal)+

3h+ again with.

H2SO4 reaction.

Chemistry Equation.

al3+3h2o

Al(OH)3 (colloidal)+

3h+2al(oh)3+3h2so4=al2(so4)3+h2o

Not pants liter will, because sulfuric acid is not a volatile acid. If aluminum sulfate is hydrolyzed, then the hydrolysate products are aluminum hydroxide and sulfuric acid, sulfuric acid does not volatile, then sulfuric acid will still dissolve aluminum hydroxide. Therefore, Hu Kuan's old aluminum sulfate is not hydrolyzed.

The hydrolysis I am talking about is the intense hydrolysis of the evaporative crystallization. It is not simply hydrolysis in solution.