How can I replace our outdated acid-base titration with inquiry-based labs?

[Nora.M]

I'm a high school chemistry teacher redesigning our introductory lab curriculum, and I want to replace our outdated, purely verification-style acid-base titration experiment with one that emphasizes inquiry and real-world application. The current lab simply has students find the concentration of a known acid, which feels like following a recipe. For other educators, what are some engaging variations on classic acid-base titration experiments you've successfully implemented? I'm considering having students identify an unknown weak acid using its titration curve and pKa or perhaps analyzing the vitamin C content in different fruit juices, but I'm concerned about time constraints and material availability. What practical setups and unknowns have worked well for you to teach the concepts while fostering genuine investigative skills?