Sulfur trioxide - SO3 + H2O -----> H2SO4
Sulphuric anhydride is H2S2O7,... H2SO4 + H2SO4-----> H2S2O7 + H2O
The reaction between salicylic acid and acetic anhydride involves the substitution of a hydroxyl group in salicylic acid with an acetyl group from acetic anhydride. This reaction is catalyzed by an acid, typically sulfuric acid, and results in the formation of aspirin and acetic acid as byproducts.
Sulfur trioxide is commonly known as sulfuric anhydride or sulfuric oxide.
If the sulfuric acid is left out of the reaction, the acetylsalicylic acid synthesis may proceed at a slower rate or not to completion. The presence of sulfuric acid helps catalyze the reaction and improves the yield of acetylsalicylic acid. It also helps in the dehydration of acetic acid formed during the reaction.
An anhydride is not an acid and not a base.
Trifluoromethanesulfonic anhydride = (CF3SO2)2O
To prepare the Liebermann-Burchard reagent you add 200 ml of cold acetic anhydride and 200 ml of glacial acetic acid at room temperature to a 500 ml amber glass bottle that has a polyseal cap. Turn the bottle upside down to mix the solution then add 30 ml of cold concentrated sulfuric acid.
Nitric acid does not form the anhydride but dinitrogen penta oxide is theoretical anhydride of nitric acid.2HNO3 = N2O5 + H2O==========No. From the Wikipedia article on nitrogen pentoxide:N2O5 was first reported by Deville in 1840, who prepared it by treating AgNO3 with Cl2.Therefore, nitrogen pentoxide is the anhydride of nitric acid.
sulfuric acid or sulphuric acid
The balanced equation for the reaction between salicylic acid and acetic anhydride to form aspirin (acetylsalicylic acid) is: salicylic acid + acetic anhydride → aspirin + acetic acid.
Your question has the names right in it. Maybe it's the chemical formulas you want. In that case, salicylic acid is C7H6O3 and acetic anhydride is C4H6O3.
succinic anhydride can be obtained by dehydration of succinic acid. first take succinic acid in the china dish. Then cover the china dish with the filter paper and make the upper part porous. Then put the inverted funnel having filter paper in it( which have its thin side blocked with cotton) over the china dish.Put the whole set up over the sand bath which is already over the flame. heat the compound till you get the crystals on the filter paper which is in the funnel.