Chemical Forums

Chemistry Forums for Students => High School Chemistry Forum => Topic started by: claire on October 24, 2004, 01:51:39 AM

Title: determining sulfuric content of lawn fertilizers
Post by: claire on October 24, 2004, 01:51:39 AM

Hi,
i have a chemistry task which says we have to work out a method to determine the sulfuirc acid content of lawn fertilizers but i have no idea how to do this.
would you please be able to suggest a method that would work for this investigation?
thanks  :)

Title: Re:determining sulfuric content of lawn fertilizers
Post by: AWK on October 25, 2004, 07:43:11 AM

Gravimetric analysis with barium sulfate as precipitate will work

Title: Re:determining sulfuric content of lawn fertilizers
Post by: kevins on October 25, 2004, 12:20:33 PM

A spectrophotometric method is a alternative method for the determination of sulfate.

1. Weight a portion of sample and dissolve in water.
2. Filter the insoluble and collect the filtrate.
3. Transfer the filtrate to a volumetric flask and top up with water.
4. Take a known portion (~25mL) of dissolved sample and add 5 mL acidified 10% BaCl2 solution.
5. Measure the absorbance against the reagent blank @450nm.

Please try ;)