Determine the equilibrium constant, Ka of 0.12 mole HNO2 is dissolved to make 1 L which has a hydronium ion (Hydrogen ion) concentration of 0.00115 mole/liter?

I have it as Ka= [H+] [NO2-] / [HNO2]

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  1. ..........HNO2 ==> H^+ + NO2^-

    You have the correct Ka expression. Substitute the E line into the Ka expession you've written like this.
    Ka = (H^+)(NO2^-)/(HNO2)
    Ka = (x)(x)/(0.12-x)
    The problem tells you x = 0.00115, Plug than in for x and solve for Ka.
    Post your work if you get stuck.

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