Procedure (Titration of Blank)

Use a volumetric pipet to dispense 25.00 mL of deionized water (DI) into a 250 mL flask.
Add 5 mL of pH 10 buffer, 2 drops of Eriochrome Black T indicator, and 15 drops of 0.03 M MgCl2.
Titrate the solution with EDTA from your buret. As you near the endpoint, the solution will turn purple. Continue to slowly add EDTA until the solution turns blue, with no trace of red.