How to Calculate Species Concentrations in a 0.010 M Solution of NaN3?

[lha08]

Homework Statement

Soldium azide, NaN3 is sometimes added to water to kill bacteria. Calculate the concentration of all species in a 0.010 M solution of NaN3. The Ka value for hydrazoic acid, HN3 is 1.9X10^-5.

Homework Equations

The Attempt at a Solution

I'm sort of confused because in the beginning i know that i have to separate NaN3 into its component elements..so in this case..NaN3-->Na+N3? or is it NaN3-->Na+3N?

 

[Borek]

NaN₃ is a salt of a weak acid HN₃.