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Chemistry Forums for Students => Analytical Chemistry Forum => Topic started by: Shamapes on February 27, 2008, 11:27:49 PM

Title: Help in Calculation
Post by: Shamapes on February 27, 2008, 11:27:49 PM

Hi all, can someone please help me with this.
I have a buffer solution of 30 g MgCl2*6H2O, 5 g of sodium acetate, 1 g KNO3, 0.111 g of Na2SO4, 20 mL of glacial acetic acid (99%) into 500 mL H20 brought up to make 1L of buffer solution.  My question is, in theory- what would be my SO4 concentration be?

Title: Re: Help in Calculation
Post by: Borek on February 28, 2008, 03:17:12 AM

Please read forum rules (http://www.chemicalforums.com/index.php?page=forumrules).

How many moles of sulfate? What final volume?

Title: Re: Help in Calculation
Post by: JGK on February 28, 2008, 08:40:36 AM

Calculate the percentage of sulphate in sodium sulphate (from mws).

Apply to the weight of sodium sulphate to get wt of sulphate present

calculate concentration (g/L, mg/L, M) as applicable.