You need to learn, and use, the correct notation for concentration. When you write 0.12m you say 0.12 molal where molal is mols/kg solvent. If you meant to say 0.12 molar where molar is mols/L of solution you should write 0.12 M. There is a difference between 0.12 m and 0.12 M.
I am assuming you meant 0.12 M HNO2 (you didn't type the HNO2) and 0.16 M NaNO2. HNO2 is the acid; NaNO2 is the base. Use the Henderson-Hasselalch equation of
pH = pKa + log [(base)/(acid)]
Substitute and solve. Post your work if you get stuck.
fin the ph for buffer 0.12m,0.16m NaN02 with the given ka(HNO2)= .5x10^-
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