This is an acid-base reaction (neutralization): FeCO3 is a base, H2SO4 is an acid.
Reactants:
FeCO3
Names: Iron(II) carbonate, Ferrous carbonate, Iron(2+) carbonateSiderite, Iron II carbonate, Iron carbonate, Ferrous monocarbonate
Appearance: White powder or crystals
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.]
Other names: Ferric sulfate, Sulfuric acid, Iron(3+) salt (3:2)Diiron tris(sulphate), Iron tersulfate, Iron sesquisulfate, Iron persulfate, Ferric tersulfate, Ferric sesquisulfate, Ferric persulfate, Diiron trisulfate, Iron(III) sulfate(VI), Ferric sulfate anhydrous
Appearance: Grayish-white crystals
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.]
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