a. before addition of any KOH
• only the acidic form exists
Equilibrium reaction: H3PO3(aq) + H2O(l) ⇌ H2PO3-(aq) + H3O+(aq) pKa1
We will need the Ka for the reaction.
Ka = 0.05012
Solids and liquids are ignored in equilibrium expressions
Phosphorous acid, H3PO4(aq), is a diprotic oxyacid that is an important compound in industry and agriculture.
pKa1 = 1.30
pKa2 = 6.70
Calculate the pH for each of the following points in the titration of 50.0 mL of a 1.5 M H3PO3(aq) with 1.5 M KOH(aq).
Part A. before addition of any KOH
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