Do you need a quicker lab for your students to run a titration and use the pKa from the graph to identify the weak acid? I've written one up that you can do in under 45 minutes! This lab allows students to titrate pineapple juice with 0.1M NaOH. Then, students use the graph to identify the pKa of the weak acid in the buffer that is added to the pineapple juice as a preservative. Given the pKa of ascorbic acid and the pKa of citric acid, students must identify the acid!
This product includes teacher instructions, a student lab sheet (with procedures) and an answer key. These items are in WORD format, so they're fully editable.
*You do need the following materials:
small can of pineapple juice (1 individual-size can per 17 lab groups)
pH meters or sensors
software or a FREE Vernier chromebook app if pH sensors are used