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VCE Stuff => VCE Science => VCE Mathematics/Science/Technology => VCE Subjects + Help => VCE Chemistry => Topic started by: VCEMan94 on April 04, 2011, 04:50:11 pm

Title: Gravimetric Prac - Finding amount of Sulfur in fertiliser question
Post by: VCEMan94 on April 04, 2011, 04:50:11 pm

Why does the experiment require the adding the HCl and heating the solution?
sorry if this seems like a silly question, just a bit confused

Title: Re: Gravimetric Prac - Finding amount of Sulfur in fertiliser question
Post by: Vincezor on April 05, 2011, 03:24:28 pm

I believe the HCL is added in order to make sure none of the OH^- ions present in the solution react with the BaCl₂ used later on - As you already know the BaCl₂ is added in order to form the precipitate, BaSO₄(s)

As for heating the solution, I am not 100% sure, but I think it has something to do with increasing the reaction rate...