How to Make an EDTA Solution
- 1). Fill your large beaker to the 900 milliter (mL) mark with deionized water.
- 2). Use your balance to measure 186.1 g of EDTA and add it to the water in the beaker. Begin stirring the solution with the magnetic stirrer when you add the EDTA.
- 3). Use your balance to measure 20 g of sodium hydroxide (NaOH) and add roughly half of it to the solution. Continue stirring.
- 4). Add a gram or two more of NaOH every couple hours and watch the EDTA. It will start to dissolve into solution as the pH approaches 8. Once it has dissolved completely, add one more gram of NaOH to the solution and stop the stirrer.
- 5). Add enough water to the solution to fill the beaker the rest of the way to the 1-liter mark.
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