How will the addition of barium chloride soln. help to distinguish between dilute HCl and dilute sulphuric acid

Dear Student,  

When barium chloride is added to hydrochloric acid no new substance is formed. 

BaCl₂ + HCl $\to$BaCl₂ + HCl 

When barium chloride is added to sulphuric acid, barium sulphate new precipitate is formed. 

BaCl₂ + H₂SO₄  $\to$BaSO₄  + 2HCl 

BaSO₄ ​​​​​​, white precipitate is formed. 

Regards