This is an acid-base reaction (neutralization): H2SO4 is an acid, Na2CO3 is a base.
This is a gas evolution reaction, CO2 is the formed gas.
Reactants:
H2SO4 – Sulfuric acid
Other names: Oil of vitriol, Sulfuric acid, concentrated (> 51% and < 100%), H2SO4Sulphuric acid, Battery acid, Hydrogen sulfate, [SO2(OH)2], [S(OH)2O2], Sulfuric acid (aqueous)
Appearance: Clear, colorless liquid ; Odourless colourless oily hygroscopic liquid ; Colorless to dark-brown, oily, odorless liquid. [Note: Pure compound is a solid below 51°F. Often used in an aqueous solution.]
Na2CO3 – Sodium carbonate
Other names: Soda ash, Washing soda, Soda crystalsSodium carbonate (anhydrous), Na2CO3, Disodium carbonate, Natriumkarbonat, Carbonic acid sodium salt (1:2), Anhydrous sodium carbonate, Carbonic acid, disodium salt, Sodium carbonate, anhydrous, Soda-ash, Natrum carbonicum, Sodium carbonate anhydrous, Sodium salt of carbonic acid, Carbonic acid disodium salt
Appearance: White solid, hygroscopic ; White hygroscopic powder
Products:
H2O – Water, oxidane
Other names: Water (H2O), Hydrogen hydroxide (HH or HOH), Hydrogen oxideDihydrogen monoxide (DHMO) (systematic name), Hydrogen monoxide, Dihydrogen oxide, Hydric acid, Hydrohydroxic acid, Hydroxic acid, Hydrol, Μ-oxido dihydrogen, Κ1-hydroxyl hydrogen(0)
Appearance: White crystalline solid, almost colorless liquid with a hint of blue, colorless gas
CO2
Names: Carbon dioxide, {{plainlist|, CO2Carbonic acid gas, Dry ice, [CO2], Carbonic anhydride, R-744, E-290, E 290, E290, Carbonic acid anhydride, Carbon-12 dioxide, Methanedione, Carbon oxide, CO₂, [Note: Normal constituent of air (about 300 ppm)].
Appearance: Colorless gas ; Odourless colourless compressed liquefied gas ; Colorless, odorless gas. [Note: Shipped as a liquefied compressed gas. Solid form is utilized as dry ice.]
Na2SO4
Names: Sodium sulfate, Sodium sulphate, Sulfate of sodiumThenardite (mineral), Glauber's salt (decahydrate), Sal mirabilis (decahydrate), Mirabilite (decahydrate mineral), Disodium sulfate, Anhydrous sodium sulfate, Sodium sulfate anhydrous, Sodium sulfate, anhydrous, Sodium sulphate anhydrous, Sodium sulphate, anhydrous, Sulfuric acid disodium salt, anhydrous, Disodium sulphate, Salt cake, Na2SO4, Sulfuric acid disodium salt
Appearance: White crystalline solid | hygroscopic ; White hygroscopic solid in various forms