Step 1:

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pH of the equation is 9.00.

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Concentration of $\"\"$ is 0.52 M.

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The equilibrium reaction is

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$\"\"$ .

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$\"\"$

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Equilibrium constant for the equation is

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$\"\"$

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Relation between $\"\"$ and $\"\"$ is $\"\"$ .

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$\"\"$

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The concentration of the $\"\"$ is 0.936 M.

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Solution:

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The concentration of the $\"\"$ is 0.936 M.