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The ionization constant of nitrous acid is 4.5 × 10–4 . Calculate the pH of 0.04 M sodium nitrite solution and also its degree of hydrolysis. 

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NaNO2 is the salt of a strong base (NaOH) and a weak acid (HNO2). 

Now, If x moles of the salt undergo hydrolysis, then the concentration of various species present in the solution will be: 

Therefore, degree of hydrolysis 

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