5 years ago. Calcium (Ca) and water Calcium and water: reaction mechanisms, environmental impact and health effects. Answer Save. 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… Calcium + Water . You can sign in to give your opinion on the answer. Yes, adding calcium to water is a chemical change. Upon hitting submit, the stoichiometric equivalents will be calculated for the remaining reactants and products. Ca + 2H2O ---> Ca(OH)2 + H2 The products of this reaction are solid calcium oxide and gaseous hydrogen. 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. 1 decade ago. The acid is H(+) in H2O and CaH2 is a base strong enough to remove a proton from water. 4 Answers. 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! 0 0. All gases are assumed to be at STP. Enter a mass or volume in one of the boxes below. CaO (s) + 1 H2O (ℓ) → Ca(OH)2 (s) Back to reactions list . The following equation represents the reaction between calcium and water. 1 decade ago. Ca … Ca(OH)2 --> Ca2+ + 2OH-2 1. Anonymous. Relevance. Favorite Answer. I'm pretty sure it doesn't just dissolve a little. Reaction Type: Synthesis. 1. What do you think of the answers? Calcium is a silvery-white metal; it is relatively soft, but much harder than sodium metal. Calcium is also a constituent of coral. H2O doesn't affect the overall reaction, the result then will be. 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. Stoichiometry . Sign in. Anonymous. Calcium occurs in water naturally. It seems to be a double displacement, because the reaction is CaH2 + 2H2O --> Ca(OH)2 + 2H2 when balanced. The balanced equation for this reaction is: Ca (s) + H2O (l) = CaO (s) + H2 (g) Seawater contains approximately 400 ppm calcium. One of the main reasons for the abundance of calcium in water is its natural occurrence in the earth's crust. For the best answers, search on this site https://shorturl.im/7csWB. Ca(OH)2 + H2O --> Ca2+ + 2OH- + H2O.

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