Andrew Wigston Posted October 29, 2020 Share Posted October 29, 2020 Hello, newbie user here, so please excuse my ignorance regarding what I think may be a simple problem. I am using GWB 14. I have a sample of brine. It has a lab-reported value for Na of 83,900 mg/L. I entered it and all the other analytes in GSS (I did not enter a solvent mass). Out of curiosity, I converted it to some of the various other units available and here is what I get (using the thermo.tdat database) mg/L mg/kg Mol (no units listed) Molal (no units listed) mol/kg mol/L 83,900 68,719 4.19 4.19 2.989 3.649 Questions: 1) what is "kg"? Is it kg of solvent or solution? 2) Is mol just the total number of moles of Na in the system? If so, is the system 1 kg of water plus the mass of all the solutes, or just 1 kg of solution? 3) My understanding is molal is mol/kg solvent. Is this the case here? Then I ran the water in SpecE8 (I didn't make any changes, like charge balancing). Some outputs for Na from the "Original Basis" portion of the text file were: Moles: 4.19 Moles in fluid: 4.19 mg/kg in fluid: 6.77E04. Questions: 1) What is "fluid" in the "Moles in fluid"? Is it 1 kg water + solutes? 2) Is moles the amount in the system? 3) Why would the mg/kg value from SpecE8 be different from that reported in GSS when I converted (they are close, but not exact)? I have attached the GSS file. The sample in question is Border-01 S2. Thanks for your help. Sincerely, Andrew Wigston Border-01.gss Quote Link to comment Share on other sites More sharing options...
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