Two titrations were performed as shown below - VCE - SSCE Chemistry - Question 11 - 2011 - Paper 1
Question 11
Two titrations were performed as shown below.
25.0 mL of 0.10 M strong monoprotic acid
25.0 mL of 0.10 M weak monoprotic acid
Which one of the following statements... show full transcript
Worked Solution & Example Answer:Two titrations were performed as shown below - VCE - SSCE Chemistry - Question 11 - 2011 - Paper 1
Step 1
A. The weak acid will require a greater volume of NaOH solution than the strong acid to reach the equivalence point.
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Answer
This statement is generally false. While weak acids do require more titrant than strong acids to reach the equivalence point, it's not a blanket rule, as it does depend on the strength and concentration of the weak acid.
Step 2
B. The weak acid will require a smaller volume of NaOH solution than the strong acid to reach the equivalence point.
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This statement is also false. In fact, the weak acid is expected to require a larger volume of NaOH, not a smaller one, due to its partial dissociation.
Step 3
C. The weak acid will require the same amount of NaOH solution as the strong acid to reach the equivalence point.
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This statement is incorrect. Although both acids have the same initial concentration, the strong acid will fully dissociate, while the weak acid will not, thereby requiring different volumes of NaOH for neutralization.
Step 4
D. The equivalence point in a titration of a weak monoprotic acid with NaOH solution cannot be determined.
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This statement is true. The shape of the titration curve for weak acids does not allow for a definitive equivalence point unless additional indicators are used.
