Calculate the ph of a solution that is 0.100 m hno2 and 1.00 m nano2

HNO₂ and NaNO₂ is considered as acidic buffer because HNO₂ is considered as weak acid and NaNO₂ is the conjugate base of this acid.

To find the original pH, we just use the Henderson-Hasselbach equation:
pH = pKa + log 

so pH = 3.4 + log  = 4.4

Hello!

For solving this question, you need to know the value of the pKa of HNO₂ before applying the Henderson-Hasselbach's equation. The pKa of HNO₂ can be found in tables or online and is 3,15. Now you can apply the equation in the following way:



So, the pH of this solution of HNO₂ and NaNO₂ should be 4,15

Have a nice day!