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Question

Explain the similarity and difference in two events, namely adding NaOH to water and adding CaO to water.

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Solution

With NaOH, you are only dissolving the material, whereas CaO reacts to make Ca(OH)2. The calcium hydroxide has a lower solubility in water than NaOH and so will precipitate out.
Adding NaOH to water:
NaOH+H2O=Na+ and OH ions. The reaction will be exothermic where heat will be released. Sodium hydroxide is considering a strong base and as such is able to completely and fully dissociate in aqueous solution.
Adding CaO to water:
A lot of heat (exothermic reaction) is produced in the reaction, which may even cause the water to boil.

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