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+.
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?
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