Potassium Tetra oxalate, 0.05 M (pH 1.68 at 25°C): Dissolve 3.1525 g of KH3(C2O4)2. 2H2O in purified water to make 250 mL. Potassium Biphthalate, 0.05 M (pH 4.01 at 25°C): Dissolve 2.5300 g of KHC8H4O4, previously dried at 110°C for 1 hour, in purified water to make 250 mL.
Equimolal Phosphate, 0.05 M (pH 6.86 at 25°C): Dissolve 0.8825 g of anhydrous disodium hydrogen phosphate (Na2HPO4) and 0.8475 g of potassium dihydrogen phosphate (KH2PO4), each previously dried at 120°C for 2 hours, in purified water to make 250 mL.
STANDARDIZATION, General Testing Procedure, potassium dihydrogen
Equimolal Phosphate, 0.05 M (pH 6.86 at 25°C): Dissolve 0.8825 g of anhydrous disodium hydrogen phosphate (Na2HPO4) and 0.8475 g of potassium dihydrogen phosphate (KH2PO4), each previously dried at 120°C for 2 hours, in purified water to make 250 mL.
STANDARDIZATION, General Testing Procedure, potassium dihydrogen
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