Solubility: Disodium EDTA is more soluble in water than EDTA. This is because the sodium ions in the disodium salt help to break up the hydrogen bonds between the EDTA molecules, making them more soluble. The higher solubility of disodium EDTA allows for the preparation of higher concentration solutions, which can be advantageous for certain applications.
Stability: Disodium EDTA is more stable in solution than EDTA. EDTA can undergo hydrolysis in aqueous solutions, which leads to the formation of metal complexes and the release of protons. This can lower the pH of the solution and reduce the effectiveness of EDTA as a chelating agent. The disodium salt of EDTA is less susceptible to hydrolysis, which means that it can maintain its chelating properties over a wider range of pH values.
pH: Disodium EDTA has a higher pH than EDTA. This is because the sodium ions in the disodium salt help to neutralize the protons released by the EDTA molecules. The higher pH of disodium EDTA makes it less corrosive to metal surfaces and biological tissues. This can be an important consideration in applications where EDTA is used as a cleaning agent or in medical procedures.
Overall, the higher solubility, stability, and pH of disodium EDTA make it the preferred choice for many applications.
