Question

explain the similarity and different IN two event namely adding NaOH to water and adding caO to water

Answer 1

Hello Dear.


As you want similarity and difference in between Sodium Hydroxide added to water and Calcium oxide added to water.

Reactions :-

1) When Sodium Hydroxide (NaOH) added to Water ⇒

NaOH + H₂O ----→ Na⁺ + OH⁻ + H₂O + Heat 

So this reaction is an Exothermic reaction because heat is produce in it.

↔

2) When Calcium oxide (CaO) added to water ⇒

 CaO + H₂O ------→ Ca(OH)₂ + Heat 

So the reaction is an exothermic because lots of heat produce in it . 

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Explanation -:

A) ←←SIMILARITY B/W THESE TWO REACTION →→

i) Both reactions are Highly Exothermic , As Heat released in both of them. 

ii) Both reaction formed Strong Alkali solution.



B) ←←DIFFERENCE B/W THESE TWO REACTIONS→→

i) Sodium Hydroxide Dissociates to form Na⁺ and OH⁻ ion . While Calcium oxide added water to form Calcium Hydroxide which further dissociates. 

ii)  NaOH is a monoacidic base. and CaO is a Di-Acidic base.


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Hope it Helps.

Have a nice day. :-)

Answer 2

Chemical Equations Involved :

1) NaOH (s) + H2O(l) --------> Na⁺(aq) + OH⁻(aq) + Δ(HEAT)

2)CaO(s) +H2O(l) ------> Ca(OH)₂  (aq) + Δ(HEAT)

Similarities:

⇒Both of the equations are exothermic means a lot of heat is evolved.

Differences :

1) NaOH is a strong base . On dissolving in water, they completely ionise and produce large amount of OH⁻ ions.

2) All bases have OH - ions 

3) Care must be taken while adding NaOH to water gradually  with stirring and not by adding water to NaOH.

3) In second equation, CaO on reacting with water produces basic solution called as Calcium Hydroxide which is used for white washing.