Question

explain the similarity and different in two event namely adding NaOH to water and adding CaO to water

Answer 1

similarity: in both the reaction water will be produced
difference
while adding NaOH to water it will produce NaO while adding CaO in water it will produce Ca(OH)2

Answer 2

Answer:

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.