Question

Adding of BaCl₂ (aq) to Na₂SO₄ (aq) should be done :

a) slowly without stirring
b) slowly with constant stirring
c) fast without stirring
d) very fast with constant stirring

Explain & justify your answer.

Answer 1

The option (b) is correct
JUSTIFICATION:
slowly with constant stirring
If we stir the solution very fastly then it may cause harm to us or a blast
so scientist said to mix a solution slowly without accerated stirring

Answer 2

this reaction is an exothermic reaction.
because BaCl2 {barrium chloride ) is an acid and Na2SO4 ( sodium sulphate ) is salt .

now,

BaCl2 + Na2SO4 ----> BaSO4 (s) + 2NaCl

here BaSO4 ( barrium sulphate ) precipitation form ,
now, if we stirring slowly then slowly form precipitation , and safe for us but if we stirring fast reaction occur fast , due to exothermic reaction . blast will be possible . so, this may harmful for us . but BaSO4 formed strictly.

if we not stirring, then precipitation also formed but incomplete reaction . for complete reaction slowly stirring required . it means if we stirring constantly then, reaction will be completed after some time

hence, according to above explanation , option (B) is correct . constant stirring required for reaction