Titration Curves of Strong and Weak Acds and Bases PowerPoint：滴定曲线的强和弱的酸和碱的PowerPoint

1、maureen c. millerchatham hall ap chemistry grades 11, 12titration curves of strong and weak acids and basesh c l (stro n g acid )n ao h (stro n g b ase)h c l (stro n g acid )n h 3 (w eak b ase)h c 2 h 3 o 2 (w eak acid )n ao h (stro n g b ase)h c 2 h 3 o 2 (w eak acid )n h 3 (w eak b ase) to react t

2、he following combinations of acids and basesto compare empirical equivalence points and ph on graph to calculated values from pre-lab.to become more familiar with titration curves by observing differences in initial ph and length of the vertical region of the curve near the eq.pt.to determine the mo

3、st suitable indicator for each of the four reactions.1. given a sample titration curve, students will correctly identify a reaction between weak and strong acids and bases2. given a sample titration curve, students will correctly choose a suitable indicator for the equivalence point. 3. given a spec

4、ific acid and base of known concentration, students will correctly determine the ph at the equivalence point.vernier datacollectorti graphingcalculatorverneir phamplifierand phelectrodeverneiradaptercablestop watch250 mlbeaker50 ml buretring stand2 utilityclamps100 mldh2o pertrialphenol-thathaleinin

5、dicator8 ml0.10 m hcl8 ml0.10 mhc2h3o250 ml0.10 mnaoh50 ml0.10 mnh3 obtain safety goggles!place 8 ml of acid solution into a 250-ml beaker. add approximately 100-ml water. add 3 drops of phenolphthalein indicator solution.fill buret with 50-ml base.connect the ph amplifier to the verneir data collec

6、tor and to computerin the logger pro program, open probes and sensor, ph sensor. select ph versus time. under experiment, select sampling. set experiment length to 240 seconds and sampling speed to 3 samples per second.once you are ready to begin collecting data, press “collect data” and open the st

7、opcock to provide a constant slow drip. at the same time, start the stop watch. swirl the solution with the ph electrode. be sure to note the time (in seconds) when the solution turns from clear to pink.strong acid / weak basestrong acid / strong base weak acid / weak baseweak acid / strong basestud

8、ents will complete the following:pre-lab assignmentpurposeproceduredata: labeled graphs, time of phenolphthalein color changeconclusion questionsgreat lab to visualize the change in ph as base is added!although we did the lab using the ti calculator and computer, we found the computer to:be much eas

9、ier to set-upprovide a more accessible visual to all studentsbe easier to manipulate data after the completion of the labgive nice print out that students can use directly in their reportsacknowledgementsthanks to everyone who made this laboratory experience successful: my ap students, michelle, emily, sara and ebony, for always working so hard, my technology savior, mr. david lyle, who spent countless hours with me connecting wires and making this lab possiblemy friend and colleague,