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Explain the similarity and difference in two events, namely adding NaOH to water and adding CaO to water. |
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Answer» Similarity : Both NaOH and CaO, when dissolved separately in water, solid NaOH dissolves releasing heat, resulting in rise in temperature. This reaction is exothermic reaction. When solid CaO dissolves in water, Ca(OH)2 is formed, large amount of heat is evolved. This reaction is also exothermic reaction. Both reactions are combination reactions and single product is obtained. NaOH(s) + H2O → NaOH(aq) + Heat CaO(s) + H2O → Ca(OH)2(aq) + Heat Difference: 1. Aqueous solution of NaOH is considered as a strong alkali. 2. Aqueous solution of Ca(OH)2 is considered as a weak alkali. |
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