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Is the reaction between calcium and water an example of a disproportion reaction?

April 26, 2017calcium Chemistry disproportion Mathematics REACTION water

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Is the reaction between calcium and water an example of a disproportion reaction?

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No, it’s not. Disproportion can be defined as atoms of the same element being both oxidized and reduced at the same time. Oxidation is the increase in oxidation number, gain in oxygen, loss of hydrogen, or loss in electrons. In your suggested chemical reaction, Calcium gets oxidized from calcium metal to calcium ion (0 to +2), while water maintains an oxidation state of -2. Hydrogen (in water) gets reduced to hydrogen gas, while maintaining no change in oxidation state in calcium hydroxide.