how can i do this?
A solution is prepared by adding 8*10^-4 moles ammonium nitrite (NH4NO2) to form one liter of solution (for Ka = 10^-9.3 for NH4OH and Ka = 10^-4.5 for in HNO2).Analytically find the concentration of each component.

Question

how can i do this?
A solution is prepared by adding 8*10^-4 moles ammonium nitrite  (NH4NO2) to form one liter of solution (for Ka = 10^-9.3  for  NH4OH  and Ka = 10^-4.5 for in HNO2).Analytically find the concentration of each component.

aaronq · Answer

When you place ammonium nitrite in water it will dissociate, like this:

$NH_4(NO_2)\rightarrow \color{green}{NH_4^+} + \color{blue}{NO_2^-}$

Each one will each with water differently:

$\color{green}{ NH_4^+ +2H_2O \rightarrow NH_4(OH) + H_3O^+}$

$\color{blue}{ NO_2^- +H_3O^+ \rightarrow HNO_2 +H_2O}$

use equilibrium expressions to find the concentrations.

NOTE: the Ka values given are for the production of $H_3O^+$, and it may not be for the reaction written but the backwards reaction.