Ka of HNO2

Rank the following in terms of acidity: HClO, IOH, and HBrO. Explain the trend.

Rank the following in terms of acidity: HClO, HClO$_2$, HClO$_3$, HClO$_4$. Explain the trend.

Find the concentration of HS$^-$, S$^{2-}$ and H$_3$O$^+$ in a 0.075 M solution of H$_2$S

H$_2$S + H$_2$O $\longrightarrow$ HS$^-$ + H$_3$O$^+$, K$_{a1}$ = 1.0 x 10$^{-7}$

HS$^-$ + H$_2$O $\longrightarrow$ S$^2-$ + H$_3$O$^+$, K$_{a2}$ = 1.0 x 10$^{-19}$

Calculate the pH and concentration of all species of a 3.0 M solution of phosphoric acid, H$_3$PO$_4$