Question

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

Answer 1

Answer:

Explanation:

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 considered a strong base and as such is able to completely and fully disassociate 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.

Answer 2

Answer:

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Explanation:

Similarity:

(i) Both NaOH and CaO dissolve in water. NaOH

dissolves in water forming aqueous NaOH

while CaO reacts with water to form Calcium

Hydroxide [Ca(OH)2

]

(ii) Both are bitter in taste, and turn red litmus to

blue. i.e. both are basic in nature.  

NaOH(s) + H2

O(l) → NaOH(aq) + Heat

CaO(s) + H2

O(l) → Ca(OH)2(aq) + Heat

Both are exothermic reactions.

(iii) After adding water, the properties of aqueous

solution of sodium hydroxide (NaOH) and

aqueous solution of calcium oxide (CaO) are

different.

Difference:

(i) Sodium Hydroxide (NaOH) is highly soluble

in water, whereas calcium oxide (CaO) is less

soluble in water.

(ii) Aqueous solution of NaOH is monovalent,

whereas aqueous solution of Ca(OH)2

is divalent.

(iii) As NaOH is highly soluble in water, makes strong

base whereas Ca(OH)2 is a weak base.