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Calcium (Ca) and water Calcium and water: reaction mechanisms, environmental impact and health effects. 1. Calcium is also a constituent of coral. Yes, adding calcium to water is a chemical change. What do you think of the answers? The following equation represents the reaction between calcium and water. Calcium occurs in water naturally. Reaction Type: Synthesis. Calcium is a silvery-white metal; it is relatively soft, but much harder than sodium metal. It seems to be a double displacement, because the reaction is CaH2 + 2H2O --> Ca(OH)2 + 2H2 when balanced. Ca … When you imagine the reaction like this, I think the double displacement concept will be more obvious: Ca(2+) + 2H(-) + 2H(+) + 2OH(-) --> Ca(2+) 2(OH)- + 2H2 and AB is CaH2, CD is HOH, AC is Ca… Relevance. For the best answers, search on this site https://shorturl.im/7csWB. 1 decade ago. CaO (s) + 1 H2O (ℓ) → Ca(OH)2 (s) Back to reactions list . I'm pretty sure it doesn't just dissolve a little. H2O doesn't affect the overall reaction, the result then will be. Seawater contains approximately 400 ppm calcium. Free Energy of Reaction (at 298.15 K) From ΔG f ° values: [1ΔG f (Ca(OH)2 (aq)) + 1ΔG f (H2 (g))] - [1ΔG f (Ca (s)) + 2ΔG f (H2O (ℓ))] [1(-868.1) + 1(0)] - [1(0) + 2(-237.18)] = -393.74 kJ-393.74 kJ (spontaneous) From ΔG = ΔH - TΔS:-393.79 kJ (spontaneous) Equilibrium Constant, K (at 298.15 K) 9.6405512369e+068 This process is favorable at 25°C. Anonymous. The acid is H(+) in H2O and CaH2 is a base strong enough to remove a proton from water. Sign in. Favorite Answer. 0 0. Upon hitting submit, the stoichiometric equivalents will be calculated for the remaining reactants and products. The products of this reaction are solid calcium oxide and gaseous hydrogen. All gases are assumed to be at STP. Ca + 2H2O ---> Ca(OH)2 + H2 Ca(OH)2 --> Ca2+ + 2OH-2 1. Anonymous. The balanced equation for this reaction is: Ca (s) + H2O (l) = CaO (s) + H2 (g) 4 Answers. Answer Save. 1 decade ago. Calcium + Water . 5 years ago. Ca(OH)2 + H2O --> Ca2+ + 2OH- + H2O. Balance this reaction: Ca(s) + H2O(l) ---> H2(g) + Ca(OH)2(aq) Update: After seeing the correct balanced reaction, I now feel silly :( Thanks for answers! You can sign in to give your opinion on the answer. Enter a mass or volume in one of the boxes below. Stoichiometry . Ca(s) + 2H2O(l) ---> H2(g) + Ca(OH)2(aq) Count the number of atoms of different elements an each side and then try to balance each of them. One of the main reasons for the abundance of calcium in water is its natural occurrence in the earth's crust. Reactions list just dissolve a little water: reaction mechanisms, environmental impact and health effects in to your... Or volume in one of the main reasons for the best answers, search on this https... Water: reaction mechanisms, environmental impact and health effects i 'm pretty sure it n't... 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