How many equivalence points would be visible for a solution of 1.0M sulfurous acid titration. Is it just two because in H2SO3 there are two H+ ions?
f (# of equivalents) is equal to number of ionizable H+ (in acid-base titration), though it has also other meaning, for instance, in electrochemistry.
Here, f = 2 because H2SO3 has 2 H+.
To determine the number of equivalence points in a titration, you need to consider the number of acidic or basic protons that can be titrated in the solution. In the case of sulfurous acid (H2SO3), there are indeed two acidic protons (H+) available for titration.
Each acidic proton requires one equivalent of a base to neutralize it. Therefore, for a 1.0M sulfurous acid solution, there would be two equivalence points. At the first equivalence point, the first acidic proton would be neutralized, and at the second equivalence point, the second acidic proton would be neutralized.
In general, the number of equivalence points in an acid-base titration depends on how many acidic or basic protons are present in the solution. Each acidic proton requires one equivalent of a base, and each basic proton requires one equivalent of an acid to neutralize it.
Remember, equivalence points are not visible directly. They are determined using a suitable indicator or by monitoring the pH change during the titration.