Question 18 (1 point)
Which acid listed below is the strongest?
Selenous acid, H$_2$SeO$_3$, K$_a$ = 3.5 x 10$^{-3}$
Hydrogen sulfide, H$_2$S, K$_a$ = 9.5 x 10$^{-8}$
Citric acid, H$_3$C$_6$H$_5$O$_7$, K$_a$ = 7.1 x 10$^{-4}$
Carbonic acid, H$_2$CO$_3$, K$_a$ = 4.5 x 10$^{-7}$