Q = Can I dissolve this in water at pH7?
A = The disodium salt of EDTA will not dissolve until the pH of the solution is adjusted to pH8.0, by the addition of Sodium hydroxide (NaOH).
• Add 18.6 g of disodium EDTA (Na2EDTA) to 80 mL of distilled / deionised water
• Adjust the pH to 8.0 with NaOH (~5 ml of NaOH)
• Bring the volume to 100ml with distilled / deionised water
• Stir vigorously on a magnetic stirrer
• Sterilize by autoclaving
• Store at room temperature