Yu:EDTA

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 * +Solution recipe for 0.5M EDTA.
 * 1. Add 186.1 g of Sodium ethylenediaminetetraacetate.H2O to 800ml of H2O.
 * 2. Stir vigorously on a magnetic stirrer.
 * 3. Adjust the PpH to 8.0 with NaOH (~20g of NaOH pellets)
 * 3. Adjust the PpH to 8.0 with NaOH (~20g of NaOH pellets)
 * 3. Adjust the PpH to 8.0 with NaOH (~20g of NaOH pellets)