Question

When EDTA solution added to ${Mg}^{2+}$ ion solution, then which of the following statement is not true?

• A. Four coordinates sites of ${Mg}^{2+}$ are occupied by EDTA and remaining two sites are occupied by water molecules.
• B. All six coordinate sites of ${Mg}^{2+}$ are occupied
• C. pH of the solution is decreased
• D. Colorless $[Mg-EDTA{]}^{2-}$ chelate is formed

Answer 1

The correct option is A Four coordinates sites of ${Mg}^{2+}$ are occupied by EDTA and remaining two sites are occupied by water molecules.

When EDTA solution added to the Mg2+ion solution, all six coordinate sites of Mg2+ are occupied, and a colourless [Mg−EDTA]2− chelate is formed. This reaction also results in the lowering of the pH of the solution.

So, the correct answer is 'Four coordinates sites of Mg2+ are occupied by EDTA and remaining two sites are occupied by water molecules.'