When tap water contains high levels of calcium, a substance called calcium carbonate (CaCO3) 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 citric acid (C6H8O7). Citric acid combines with calcium carbonate to form calcium citrate (Ca3C12H10O14), carbon dioxide gas (CO2), and water (H2O). 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 all that apply.calcium carbonate (CaCO3)citric acid (C6H8O7)carbon dioxide (CO2)calcium citrate (Ca3C12H10O14)Submit
Question
When tap water contains high levels of calcium, a substance called calcium carbonate (CaCO3) 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 citric acid (C6H8O7). Citric acid combines with calcium carbonate to form calcium citrate (Ca3C12H10O14), carbon dioxide gas (CO2), and water (H2O). 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 all that apply.calcium carbonate (CaCO3)citric acid (C6H8O7)carbon dioxide (CO2)calcium citrate (Ca3C12H10O14)Submit
Solution
The reactants in the chemical reaction described in the passage are calcium carbonate (CaCO3) and citric acid (C6H8O7). These are the substances that combine to form new products during the reaction.
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The Lime-Soda process involves the addition of lime (calcium hydroxide) and soda ash (sodium carbonate) to hard water. The chemicals react with the calcium and magnesium compounds in the water, precipitating them as insoluble solids that can be removed by sedimentation and filtration.Process StepsPre-treatment: Raw water is screened to remove large particles and debris.Chemical Addition:Lime is added to the water to remove temporary hardness and part of the permanent hardness.Soda ash is added to remove the remaining permanent hardness.Mixing: The water is mixed thoroughly to ensure a complete reaction of the chemicals with the hardness ions.Sedimentation: The water is allowed to settle in sedimentation tanks where the precipitated calcium carbonate (CaCO₃) and magnesium hydroxide (Mg(OH)₂) settle out.Filtration: The clarified water is filtered to remove any remaining suspended particles.Post-treatment: The treated water may be further processed, such as disinfection or pH adjustment, before distribution.
A 3L water sample has a hardness of 300ppm by mass CaCO3. The grams of Calcium Carbonate CaCO3 is:Question 34Select one:a.1.0gb.0.20gc.0.30gd.1.20g
Solid calcium carbonate (CaCO3) reacts with sulfuric acid (H2SO4), which is an aqueous solution. The reaction has three products: solid calcium sulfate (CaSO4), liquid water and carbon dioxide gas.Describe the chemical reaction using both a word equation and a symbol equation.Note: You can copy and paste this arrow: →
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