A student titrates 10.0 mL samples of 1.0 Msolutions of each of the haloacetic acids with astandard solution of NaOH. Which of thefollowing statements correctly predicts thevolume of NaOH(aq) needed to reach theequivalence point?(A) Fluoroacetic acid will need the smallestvolume of NaOH(aq) to reach theequivalence point.(B) Iodoacetic acid will need the smallest volumeof NaOH(aq) to reach the equivalencepoint.(C) All of the acids will need the same volume ofNaOH(aq) to reach the equivalence point.(D) All of the haloacetic acids are weak; thereforenone will reach an equivalence point.Unauthorized copying or reuse ofany part of this page is illegal. GO ON TO THE NEXT PAGE.-16-
Question
A student titrates 10.0 mL samples of 1.0 Msolutions of each of the haloacetic acids with astandard solution of NaOH. Which of thefollowing statements correctly predicts thevolume of NaOH(aq) needed to reach theequivalence point?(A) Fluoroacetic acid will need the smallestvolume of NaOH(aq) to reach theequivalence point.(B) Iodoacetic acid will need the smallest volumeof NaOH(aq) to reach the equivalencepoint.(C) All of the acids will need the same volume ofNaOH(aq) to reach the equivalence point.(D) All of the haloacetic acids are weak; thereforenone will reach an equivalence point.Unauthorized copying or reuse ofany part of this page is illegal. GO ON TO THE NEXT PAGE.-16-
Solution
The correct answer is (C) All of the acids will need the same volume of NaOH(aq) to reach the equivalence point.
Here's why:
The equivalence point in a titration is reached when the moles of the titrant (in this case, NaOH) equal the moles of the substance being titrated (in this case, the haloacetic acids).
The molarity (M) of a solution is defined as the number of moles of solute per liter of solution. Since all the haloacetic acids are 1.0 M solutions, they all contain the same number of moles of acid per liter of solution.
Furthermore, the volume of the acid solutions being titrated is the same (10.0 mL). Therefore, the number of moles of each acid is the same.
Since the number of moles of acid is the same for each titration, the volume of NaOH needed to reach the equivalence point (where the moles of NaOH equal the moles of acid) will also be the same for each titration.
Therefore, all of the acids will need the same volume of NaOH(aq) to reach the equivalence point.
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