Question

While performing an experiment on neutralization reaction, Ravi took about 100 ml of dil.
sodium hydroxide solution and poured approximately the same amount of concentrated
hydrochloric acid to it.
He observed a very vigorous reaction with evolution of large amount of heat. When he dipped
litmus paper into the solution it turned red. He was surprised with the result even though he
had read all the instructions and precautions given to him by his teacher.
(i) What was the expected result of the experiment?
(ii) What went wrong in the experiment performed by Ravi?
(iii) Why Ravi observed a very vigorous reaction with evolution of large amount of heat when
he added concentrated hydrochloric acid to sodium hydroxide?

Answer 1

Answer:

(i) Litmus paper should not change colour.

(ii) He used dil. sodium hydroxide and conc. hydrochloric acid.

(iii) Because hydrochloric acid ia a strong acid whereas sodium hydroxide is a strong base.

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