This is an acid-base reaction (neutralization): K2CO3 is a base, H2SO4 is an acid.
Reactants:
K2CO3 – Potassium carbonate
Other names: Carbonate of potash, Dipotassium carbonate, Sub-carbonate of potashPearl ash, Potash, Salt of tartar, Salt of wormwood., Potassium carbonate (anhydrous), K2CO3, Carbonic acid, dipotassium salt, Potassium carbonate, anhydrous, Kaliumcarbonat, Potash, sulfurated
Appearance: White, hygroscopic solid ; Colourless hygroscopic crystals or hygroscopic white powder
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.]