The acid-dissociation constants of phosphoric acid (H3PO4) at 25 degrees Celsius are Ka1 = 7.510-3, Ka2 =6.2 10-8, and Ka3 =4.210-13.  What is the PH of a 2.5M aqueous solution of phosphoric acid?

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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.