100 mM phosphoric acid (sodium) buffer solution (pH=2.1) Sodium dihydrogen phosphate dihydrate (M.W.=156.01)..50 mmol (7.8 g) Phosphoric acid (85 %, 14.7 mol/L)…………………….50 mmol (3.4 mL) Add water to make up to 1 L. 10 mM phosphoric acid (sodium) buffer solution (pH=2.6) Sodium dihydrogen phosphate dihydrate (M.W.=156.01)..5 mmol (0.78 g) Phosphoric acid (85 %, 14.7 mol/L)…………………….5 mmol (0.34 mL) Add water to make up to 1 L. (Alternatively, dilute 100 mM phosphoric acid (sodium) buffer solution…
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