how to make H2SO4?

Question

Are there any procedure to make H2SO4 in lab?

Answer 1

Hi!
The method using a Va catalyst is not a laboratory method. It's the industrial preparation of the chemical. Most labs purchase this acid as it's difficult to implement the industrial method in the lab.

Answer 2

There are innumerable other ways to produce H2SO4 in the lab, depending on what basic material you have.

One could be the reaction

Fe2(SO4)3 + 2H3PO4 -> 2 FePO4 + 3 H2SO4

Another way would be the combustion of sulphur to sulphur dioxide, which then is caught in H2O2 (or in H2O with a constant flow of oxygene).

Answer 3

this is directly from the wikipedia source:

Sulfuric acid is produced from sulfur, oxygen and water via the contact process.

In the first step, sulfur is burned to produce sulfur dioxide.

(1) S(s) + O2(g) → SO2(g)

This is then oxidised to sulfur trioxide using oxygen in the presence of a vanadium(V) oxide catalyst.

(2) 2 SO2 + O2(g) → 2 SO3(g) (in presence of V2O5)

Finally the sulfur trioxide is treated with water (usually as 97-98% H2SO4 containing 2-3% water) to produce 98-99% sulfuric acid.

(3) SO3(g) + H2O(l) → H2SO4(l)

Note that directly dissolving SO3 in water is impractical due to the highly exothermic nature of the reaction. Mists are formed instead of a liquid. Alternatively, the SO3 is absorbed into H2SO4 to produce oleum (H2S2O7), which is then diluted to form sulfuric acid.

(3) H2SO4(l) + SO3 → H2S2O7(l)

Oleum is reacted with water to form concentrated H2SO4.

(4) H2S2O7(l) + H2O(l) → 2 H2SO4(l)

Answer 4

Try oxidising sulfur to produce SO3 and bubble it through water to produce H2SO4. NOT!

Personally I would prefer to purchase some H2SO4 rather than fiddle about with toxic, corrosive gas to produce acid of uncertain quality and concentration.

Answer 5

reactions involvind SO2 and water, can procude H2SO3, and H2S +water can form H2SO4:
H2S + 2H2O-->H2SO4 +H2