Selenious acid (H2SeO3), a diprotic acid has Ka1=3.0×10^−3 and Ka2=5.0×10^−8. What is the [OH−] of a 0.30 M solution of selenious acid? a diprotic acid has Ka1=3.0×10^−3 and Ka2=5.0×10^−8. What is the [OH−] of a 0.30 M solution of selenious acid? Selenious acid (H2SeO3) November 12, 2020 Category: Chapter 6 - Ionic Equilibrium (Level 1 and Level 2) , N Awasthi Physical Chemistry , Facebook Messenger WhatsApp Share this:TwitterFacebook Related