Print Calculator | Periodic Table Ebook Question 22 of 27 (1 point) Nitric acid

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Print Calculator | Periodic Table Ebook Question 22 of 27 (1 point) Nitric acid (HNOs) is a strong acid that is completely ionized in aqueous solutions of concentrations ranging from 1% to 10% (1.5 M). However, in more concentrated solutions, part of the nitric acid is present as un-ionized molecules of HNO3. For example, in a 50% solution (7.5 M) at 25°C, only 33% of the molecules of HNO3 dissociate into H and NO3. What is the value of Ka for HNO3? Number o Hint Check Answer View Solution Progress :

Explanation / Answer

HNO3    ----------------->   H+   +    NO3-

7.5                                    0             0      ---------> initial

- x                                     x             x        ---------> change

7.5 - x                              x              x         -----------> equilibrium

% ionization = ([H+] / [HNO3] ) x 100

        33            = ( x / 7.5 ) x 100

x = 2.475

Ka = x^2 / 7.5 - x

      = (2.475)^2 / 7.5 - 2.475

Ka = 1.2

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