Solubility

• How Soluble Is EDTA in Water?
  EDTA free acid dissolves only sparingly in water—about 0.5 g/L near room temperature—while pH and sodium salts can greatly increase solubility.
• Why Is the Heat of Solution Positive or Negative?
  A positive heat of solution means dissolving absorbs heat; a negative value means it releases heat, depending on the stated sign convention.