Why is Barium Chloride Preferred Over Lead Chloride for Sulfate Precipitation?

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Barium chloride is preferred over lead chloride for sulfate precipitation primarily due to its higher solubility, which allows for more efficient precipitation of barium sulfate. Barium sulfate (BaSO4) has lower solubility compared to lead sulfate (PbSO4), leading to a more effective and clearer gravimetric analysis. The use of BaCl2 minimizes potential interference and improves the reliability of sulfate quantification. Additionally, barium's lower toxicity compared to lead makes it a safer choice for laboratory procedures. Overall, these factors make barium chloride the preferred agent in sulfate precipitation experiments.
Stroodle
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Hi there.

I'm just wanting to know the most important reason why barium chloride is chosen over lead chloride as the precipitation agent when trying to determine, by gravimetric analysis, how much sulfate is in a sample.

I think it's probably due to BaCl2 having a higher solubility, but I just want to confirm.
In the experiment the BaCl2 (or PbCl2) is added to a heated solution containing the sulfate ions.

Thanks!
 
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What about the solubilities of PbSO4 and BaSO4?
 

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