While preparing dil. Sulphuric acid from concentrated conc. Sulphuric acid in the laboratory the concentrated sulphuric acid is, add slowly to water with constant stirring?
Answers
While Preparing Dilute Sulphuric Acid in a Laboratory, Acid is added slowly to water (Water is never added to the acid as it will be the exothermic process which can cause Fatal to the person) with constant stirring because it will not cause any harm to the Person or any Apparatus in the laboratory.
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Answer:
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Explanation:
(i) Concentrated sulphuric acid (H2 SO4 ) is a
hazardous, highly corrosive chemical. It has a
higher density than water and is hygroscopic,
which means that it absorbs water from the air.
(ii) In the process of dilution of concentrated
sulphuric acid with water, very large amount of
heat is liberated.
(iii) As a result, water gets evaporated instantaneously
along with splashing of acid which may cause an
accident.
(iv) To avoid this, required amount of water is
taken in a glass container and small quantity of
concentrated sulphuric acid at a time is added
with stirring.
(v) Therefore, only a small amount of heat is liberated
at a time.