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→Determine NaCl concentration from rw
==Determine NaCl concentration from r<sub>w</sub>==
==Determine NaCl concentration from r<sub>w</sub>==
[[file:formation-fluid-pressure-and-its-application_fig5-5.png|thumb|{{figure number|1}}Determining NaCl concentration. Copyright: Schlumberger.]]
[[file:formation-fluid-pressure-and-its-application_fig5-5.png|300px|thumb|{{figure number|1}}Determining NaCl concentration. Copyright: Schlumberger.]]
The predominant solute in most formation water is sodium chloride (NaCl). Its concentration determines formation water density and R<sub>w</sub>. When only R<sub>w</sub> is available, we can use NaCl concentration to determine density.
The predominant solute in most formation water is sodium chloride (NaCl). Its concentration determines formation water density and R<sub>w</sub>. When only R<sub>w</sub> is available, we can use NaCl concentration to determine density.