Problem: Knowing that NaNO2 is the salt of a strong base and weak acid calculate : a: pH of 0.100 M NaNO2 solution. Ka of HNO2 = 4.6 x 10-4.

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To calculate pH of starting NaNO2 solution and after each addition of HCl


a) NaNO2 dissociates into ions: Na+ + NO2- and reacts with water: 

  • NO2- is conj. base of weak acid HNO2


Step 1: ICE Chart 



The Kb expression for NO2-  is:


Kb=productsreactants=[HNO2][OH-][NO2-]


Calculate Kb:  

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Problem Details

Knowing that NaNO2 is the salt of a strong base and weak acid calculate : 

a: pH of 0.100 M NaNO2 solution. Ka of HNO2 = 4.6 x 10-4.

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Our tutors have indicated that to solve this problem you will need to apply the Weak Bases concept. If you need more Weak Bases practice, you can also practice Weak Bases practice problems.

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