Question

Why is dilute hcl added to solution in gravimetry analysis?

Answer 1

Hii dear here is your answer



Barium salts can react with water in solution, particularly OH-(aq) to form Ba(OH)2. I think this is not massively soluble and may remove some of the Ba2+ ions from the solution before they are precipitated with SO42-. I suspect the HCl is to prevent this by removing any Ba(OH)2 and changing it back to BaCl2.
An excess of Na2SO4 will be needed to ensure complete precipitation of BaSO4

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