This is an acid-base reaction (neutralization): CaCO3 is a base, HNO3 is an acid.
Reactants:
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CaCO3 – Calcium carbonate
Other names: Calcite; aragonite; chalk; Lime (material); Limestone; marble; oyster; pearl;, Calcium salt of carbonic acid, Children's Mylanta Upset Stomach Relief
Appearance: Fine white powder; chalky taste ; White powder or pellets
HNO3 – Nitric acid
Other names: Aqua fortis, Spirit of niter, Eau forte
Appearance: Colorless, yellow or red fuming liquid ; Colourless-to-yellow liquid with pungent odour ; Colorless, yellow, or red, fuming liquid with an acrid, suffocating odor. [Note: Often used in an aqueous solution. Fuming nitric acid is concentrated nitric acid that contains dissolved nitrogen dioxide.]
Products:
H2O – Water, oxidane
Other names: Water (H2O), Hydrogen hydroxide (HH or HOH), Hydrogen oxide
Appearance: White crystalline solid, almost colorless liquid with a hint of blue, colorless gas
CO2
Names: Carbon dioxide, {{plainlist|, CO2
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.]
2 – Balanced equation){kind=link}