Please help with this Chemistry problem!!!?

Posted on 2017-05-11 18:37:00 in Chemistry by NAIR

Phosphorous acid, H3PO3(aq), is a diprotic oxyacid that is an important compound in industry and agriculture. 

Calculate the pH for each of the following points in the titration of 50.0 mL of a 2.1 M H3PO3(aq) with 2.1 M KOH(aq). 

pKa1 = 1.30 
pKa2 = 6.70 

(a) before addition of any KOH 
(b) after addition of 25.0 mL of KOH 
(c) after addition of 50.0 mL of KOH 
(d) after addition of 75.0 mL of KOH 
(e) after addition of 100.0 mL of KOH

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