A 3.5% saline solution prepared with water and sodium has a pH of 6.38.
I want to make a solution of 3.5% salinity with a pH of 8.1 how do i do this using only sodium, and sodium bicarbonate?
I need to adjust for the sodium of the sodium bicarbonate in regards to the salinity whilst maintining a ph of 8.1 and salinity of 3.5%.
The aim of this is to make a solution that will resemble sea water pH and salinity.
The solubility of NaHCO3 is 8.7 g at 20 0C and 10 g at 30 0C per 100 ml water. The saturated solution at 25 0C contains approximately 9.5% NaHCO3 with pH around 8.1±0.1. But this would give a maximum salinity of 2.6%. To attain desired salinity of 3.5%, whether additional sodium can be added through NaCl !! The following link may provide useful clues:
http://www.ibtbiomed.com/tech_corner/pdf/sodium_bicarb.pdf
There are protocols to make artificial sea water: the most cited one is Kester et al.one at http://qyoiukn.aslo.net/lo/toc/vol_12/issue_1/0176.pdf, but care must be applied to mix up volumetric solutions with the final partial volumes of water. NaHCO3 was about 0.2g/kg sol and pH above 8.1
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