[Fliss247]

Calculate the pH to 2 decimal places of a buffer containing 0.0160 mol/L nitrousacid and 0.0461 mol/L of sodium nitrite. For nitrous acid at 25°C, pKa = 3.37

I did:

pH = pKA + log (base/acid)
pH = 3.37 + log (0.0160/0.0451) = 2.91

Have i got the correct equation? because came back wrong

[subro]

The base is the sodium nitrite, not the nitrous acid (that's is an acid, as its name shows)

So the proper solution is pH=pKa+log(0.0461/0.0160)