Explain the similarity and difference in two events , namely adding NaOH to water and adding CaO to water..
Answers
Answer:
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 CaO to Water :A lot of heat (exothermic reaction) is produced in the reaction, which may even cause the water to boil.
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.