Phosphoric acid is a triprotic acid (K₁1 = 6.9 × 10-³, K₁2 = 6.2 × 10-8, and Ka3 = 4.8 × 10-¹³). To find the pH of a buffer composed of H₂PO4 (aq) and HPO¯(aq), which pK₁ value should be used in the Henderson-Hasselbalch equation? pKal = 2.16 PK₁2 = 7.21 PK₂3 = 12.32 Calculate the pH of a buffer solution obtained by dissolving 20.0 g of KH₂PO4(s) and 30.0 g of Na₂HPO4(s) in water and then diluting to 1.00 L. pH =

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Acid Base Titration

An acid-base titration is the method of quantitative analysis for determining the concentration of an acid and base by exactly neutralizing it with a standard solution of base or acid having known concentration.