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