For the NaCl eutectic I've seen two values widely used:

23.3wt% NaCl - James G. Speight: Lange's Handbook of Chemistry 2017)

5.1 M NaCl (Marion + Kargel 2008 - Cold Aqueous Planetary Geochemistry with FREZCHEM)

both of which are at about -21C.

Am I being silly - these values aren't the same (they're both at atmospheric pressure)?

Is my maths right? [23.3wt%=3.99M and 5.1M= 29.8wt%]

  • $\begingroup$ What density are you using for the comparison? $\endgroup$ – Ivan Neretin May 21 '17 at 14:55
  • $\begingroup$ I've just been reading off quote values, so would a 5.1M solution, corrected for density at -21C, be 23.3wt%?t $\endgroup$ – potatasbravas May 21 '17 at 15:45
  • $\begingroup$ I guess it would. $\endgroup$ – Ivan Neretin May 21 '17 at 16:15
  • $\begingroup$ I've found that the specific gravity of a 23.3 wt% solution is 1.179. How would I use this to work out the molarity of the solution $\endgroup$ – potatasbravas May 22 '17 at 17:11
  • $\begingroup$ What is molarity, really? $\endgroup$ – Ivan Neretin May 22 '17 at 18:07

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