[CLF3FTW]

I have read that a 1:1 (molar) mixture of sodium sulfate decahydrate and table salt has a melting point of 18 C, while the pure decahydrate has a melting point of 32 C. Does anyone know if having a lower ratio of table salt will cause the melting point to be somewhere in between 18 and 32 C, or if it will just make a mixture of the pure decahydrate and the decahydrate/table salt mixture? I have looked on Google for over an hour, but couldn't find anything. I have also tried to synthesize it from baking soda and Epsom salt (the reaction was listed on Wikipedia), but I couldn't drive the reaction to completion except for boiling, and I don't have the setup for a reflux.

[AWK]

To obtain crystalline bloedite (Na₂SO₄·MgSO₄·4H₂O) dissolve both salts in molar ratio 0.4 Na₂SO₄ to 0.6 MgSO₄ (calculated as anhydrous salts) and crystallize slowly by evaporation at temperature range 22-28 C.

http://www.phasediagram.dk/ternary/ternary2.htm

minor correction

[CLF3FTW]

To obtain crystalline bloedite (Na₂SO₄·MgSO₄·4H₂O) dissolve both salts in molar ratio 0.4 Na₂SO₄ to 0.6 MgSO₄ (calculated as anhydrous salts) and crystallize slowly by evaporation at temperature range 22-28 C.

http://www.phasediagram.dk/ternary/ternary2.htm

Are there any graphs like this but with sodium chloride instead of magnesium sulfate? This doesn't really relate to the question that I asked, but thank you for at least trying to help. Am I missing something obvious on the site that you linked?

[AWK]

I do not know. The only known (for me) is a mixed salt that contain both NaCl and MgSO₄ and also Na₂SO₄ (d'ansite 3NaCl·9Na₂SO₄·MgSO₄).
But if you read about it in trustworthy source then you have a good starting point.

[Intanjir]

Google for:
Phase Equilibria for the Pseudo-ternary System (NaCl + Na 2SO4 + H2O) of Coal Gasification Wastewater at T = (268.15 to 373.15) K