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Solubility of MgSO4 in water
of the anhydrous salt
26.9 g/100 mL (0 °C)
25.5 g/100 mL (20 °C)

of the heptahydrate
71 g/100 mL (20 °C)

Solubility of NaCl
359 g L−1 = 35.9 g/100 mL

More solubility values are also given here for higher temps:
Solubility table - Wikipedia

Hope this helps! Values obtained from wikipedia. Did you still need help calculating the pH values? It sounded as though you were proceeding, are you using 300 mL + 100 mL MgSO4 solution for 400 mL in total or 300 mL in total?

[QUOTE="cave paintings, post: 3632746, member: 5789"] Solubility of MgSO4 in water of the anhydrous salt 26.9 g/100 mL (0 °C) 25.5 g/100 mL (20 °C) of the heptahydrate 71 g/100 mL (20 °C) Solubility of NaCl 359 g L−1 = 35.9 g/100 mL More solubility values are also given here for higher temps: [URL="http://en.wikipedia.org/wiki/Solubility_table"]Solubility table - Wikipedia[/URL] Hope this helps! Values obtained from wikipedia. Did you still need help calculating the pH values? It sounded as though you were proceeding, are you using 300 mL + 100 mL MgSO4 solution for 400 mL in total or 300 mL in total? [/QUOTE]