would bromocresol green be a good indicator for the titration of CH3COOH against NaOH?

According to my table, bromocresol green changes pH between 3.8 and 5.4. You can calculate the approximate pH for the equivalence point for CH3COOH vs NaOH and that is about 8.5 or so. What do you think?

For HCl I got between 3.48 and 5.68

And for CH3COOH I got between 6.20 and 7.16

What formula do you use to calculate the equivalence point?

And thanks for the help!

mL x M = mL x M will give you the equivalence point. And I have no idea what Alix is talking about. It doesn't have anything to do with this problem.

To determine whether bromocresol green would be a suitable indicator for the titration of acetic acid (CH3COOH) against sodium hydroxide (NaOH), we need to consider the properties of both the indicator and the reaction being studied.

Bromocresol green is a pH indicator that changes color in the presence of acids and bases. It transitions from yellow in acidic solutions to blue in basic solutions, with a transition range typically between pH 3.8 and 5.4.

In the case of a titration, the goal is to determine the equivalence point, where the moles of acid react completely with the moles of base. Ideally, the indicator should change color within close proximity to the equivalence point, allowing for accurate determination.

Acetic acid is a weak acid, and its reaction with sodium hydroxide is a standard acid-base neutralization reaction:

CH3COOH + NaOH → CH3COONa + H2O

To assess whether bromocresol green is a good indicator for this titration, you can determine the pH range at which the bromocresol green undergoes its color change and compare it to the expected pH range around the equivalence point of the reaction.

Here's how you can do that:

1. Use a pH indicator color chart or conduct an experiment to determine the pH range over which bromocresol green changes color (yellow to blue).
2. Determine the approximate pH range of the equivalence point for the acetic acid-sodium hydroxide titration. This can be done by calculating the pKa of acetic acid and estimating the pH range around half-neutralization (pH = pKa).
3. Compare the pH range of the bromocresol green indicator with the estimated pH range around the equivalence point. If they overlap to a significant extent, then bromocresol green could be a good indicator for this titration.

By following these steps, you will be able to determine whether bromocresol green is a suitable indicator for the titration of acetic acid against sodium hydroxide.