# Al + H2SO4 = Al2(SO4)3 + SO2 + H2O

Aluminum (Al H2SO4) reacts with the concentrated sulfuric acid to generate aluminum sulfate Sulfer di-oxide as well as water when the sulfuric acid is very concentrated. The reaction is a Redox reaction. So The reaction is-

Al + H2SO4 (conc.) = Al2(SO4)3 + SO2 + H2O

## Is the reaction is Redox:

Yes, The above reaction is an Oxidation-Reduction reaction because-

1. The Al oxidation number in the reactants is zero and Al on the left-hand side is + 3 in the aluminum sulfate.
2. On the other hand, the Sulfer oxidation number in the reactants is + 6 but the oxidation number is lowered to + 4 on the left side in Sulfer di-oxide. That means the reaction is a Redox reaction.

## Sulfuric acid and Aluminum (Al H2SO4):

A chemical element with symbol Al and atomic number 13 is Aluminum or Aluminium. It is metal and very useful for our everyday life. It is a silvery-white, soft and nonmagnetic metal.

Sulfuric acid has a molecular formula H2SO4 and a mineral acid. It is a colorless, odorless, and syrupy liquid that is soluble in water. In this reaction, it acts as an acidic as well as an oxidizing agent. Its corrosiveness can be attributed primarily to its powerful acidic nature and its dehydration and oxidizing characteristics at an elevated concentration.

## Balancing the equation of the reaction:

After balancing the equation of the reaction we will get-

2 Al + 6 H2SO4 (conc.) = Al2(SO4)3 + 3 SO2 + 6 H2O

As the reaction is a Redox reaction, we can use the ion-electron method to prof the balance of the equation. ## Ion-Electron method

The redox reaction equation between aluminum and sulfuric acid (Al H2SO4) in the skeleton form is –

Al + H2SO4 (conc.) = Al2(SO4)3 + SO2 + H2O

♦The H2SO4 will function as both acid and oxidizing agent in this situation.♦

Here,

The Oxidizing agent: H2SO4
The Reducing agent: Al

Oxidation Half Reaction:

⇒ Al – 3e = Al3+ … … … … (1)

Reduction Half Reaction:

⇒ 4H++ SO42- + 2e = SO2 + 2H2O … … … … (2)

Now, equation (1)x2 + (2)x3,

2Al – 6e = 2Al3+

12H+ 3SO42- + 6e = 3SO2 + 6H2O

⇒ 2Al  +  12H+ 3SO42- = 2Al3+ + 3SO2 + 6H2O

⇒ 2Al  +  (12H+ 3SO42-) + 3SO42- = Al2(SO4)3+ 3SO2 + 6H2O

⇒ 2Al  +  (12H2 + 6SO42-)= Al2(SO4)3+ 3SO2 + 6H2O

⇒ 2 Al + 6 H2SO4(conc) = Al2(SO4)3 + 3 SO2 + 6 H2O

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-Albert Einstein

Click on the reaction to learn to balance redox reaction easily by ion-electron method

KMnO4 + H2O2 + H2SO4 = O2 + MnSO4 + K2SO4 + H2O

FeSO4 + KMnO4 + H2SO4 = Fe2(SO4)3 + MnSO4 + H2O + K2SO4

NaCl + KMnO4 + H2SO4 = Cl2 + MnSO4 + Na2SO4 + K2SO4 + H2O

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