You are titrating 30 mL of 0.100M H3PO4 with 0.200 M KOH. For H3PO4: Ka1=1.1X 10-2, Ka2 = 7.5 X 10-8, and Ka3 = 4.8 X 10-13. What is the pH after you add 15.00 mL of KOH?

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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.