Photo AI
Which of the following best represents the pH of the solution at the equivalence point and the name of a suitable indicator for this titration? pH at the equivalence point suitable indicator A - VCE - SSCE Chemistry - Question 9 - 2009 - Paper 1
Question 9
Which of the following best represents the pH of the solution at the equivalence point and the name of a suitable indicator for this titration? pH at the equivalenc... show full transcript
Worked Solution & Example Answer:Which of the following best represents the pH of the solution at the equivalence point and the name of a suitable indicator for this titration? pH at the equivalence point suitable indicator A - VCE - SSCE Chemistry - Question 9 - 2009 - Paper 1
Step 1
pH at the equivalence point
Answer
At the equivalence point of a strong acid-strong base titration, the pH of the solution is typically around 7. However, for weak acid-strong base titrations (or vice versa), the pH can be greater than 7 due to the formation of a weak conjugate base or vice versa. Considering the options and typical behavior, we conclude that the pH at the equivalence point is generally greater than 7.
Step 2
suitable indicator
Answer
In titrations where the equivalence point results in a pH greater than 7, a suitable indicator would be one that changes color in the basic range. Bromophenol blue is an appropriate choice as it changes from yellow in acidic solutions to blue in basic solutions, making it ideal for detecting the endpoint in such titrations.