The given graph is a titration curve obtained for an acid base titration. How many protons are released from the acid used in this titration ? (Hint:asking whether monoprotic, diprotic...etc)

Question

BlackTom AI · Accepted Answer

The question presents a titration curve and asks how many protons are released from the acid used in the titration.
First, observe the overall shape of the curve: there are two distinct vertical (steep) regions where the pH changes rapidly with small additions of base. These correspond to equivalence points where protons are fully neutralized by the titrant.
If there were only one equivalence point, the curve would show a single sharp rise in pH. A monoprotic acid typically shows one such jump.
In this graph, the first sharp rise occurs around approximately 10 mL of added 0.100 M NaOH, and the second sharp rise occurs around roughly 20 mL. Each sharp rise indicates the deprotonation of one acidic proton per molecule, i.e., a stepwise removal of protons from the acid.
Therefore, the acid must donate two protons (it is diprotic) to be completely titrated by the base, as evidenced by two distinct equivalence points on the titration curve.
Alternately, if there were three or more protons (triprotic or polyprotic beyond diprotic), we would expect three or more vertical jumps corresponding to successive deprotonations, which is not observed here.
Thus, from the presence of two equivalence points on the curve, the acid releases two protons in total during titration.

The given graph is a titration curve obtained for an acid base titration. How many protons are released from the acid used in this titration ? (Hint:asking whether monoprotic, diprotic...etc) 单项选择题

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