When tap water contains high levels of calcium la substance called calcium carbonate (CaCO; ) can build up at the mouths of water faucets. This buildup, called limescale, can prevent water from flowing through a faucet properly. To remove the calcium carbonate, you can scrub the faucet with citricacid (C H.O ). Citric acid combines with calcium carbonate to form calcium citrate (Ca; CoH160, (), carbon dioxide gas (CO?), and water (H,O). The calcium citrate washes away easily, allowing water to flow through the faucet again, In the chemical reaction described in the passage, which of the following are reactants? Select ah that apply. carbon dioxide (CO2) calcium carbonate (Caco;) water (H20) citric acid ( Colson)