1. Determine the concentration of an unknown acid or base using data collected using acid-base titration.
2. Explain the information presented on a titration curve to determine the equivalence point during acid-base titration.
Here is an introduction of the basics of titration -- there's a bit of a sales pitch (sorry) but it's a good introduction:
I like that he points out to read the bottom of the meniscus and the significant figures of the buret.
At a high school level, you probably don't have enough volumetric pipets for a class -- simply measuring with a graduated cylinder is fine.
He mentions that after the initial "rough" titration to add all but 5 mL of that amount and then slow down to a dropwise addition. This initial amount is sometimes called a "dump" or "dumping" that amount of reactant to the flask.
Here is another demonstration -- instead of using a volumetric pipet, he uses another buret. He does go past the end point a few times -- I think it's just to show that if you do, it's not the end of the world.
Here are a few acid-base titration lab handouts:
This lab is 3-pages, but a nice overview:
This lab is 3-pages, but the 3rd page contains supplemental problems and could be omitted:
And this final lab is 2 pages, so it could be copied to one 2-sided page (my goal for you):
Here is a quick 3-minute video solving a strong acid / strong base titration problem:
OK, continuing on, here's another problem being solved with the units included:
I'm sticking with strong acid / strong base titrations as that is typical of an introductory high school chemistry course.
Here's one worksheet with answers:
This is a little longer, but it has answers, too!
Oh, and here are some multiple choice questions with answers:
The pH changes in a mixture can be graphed producing a titration curve, a graph of pH vs. volume of acid or base added. Here's one discussion:
Here's another discussion (about 10 minutes) to examine the topic of the acid-base titration curve:
Here are directions for using Excel to plot a titration curve and a link to directions to find the equivalence point:
Well, my computer has been fixed so I should be back into a Sunday & Wednesday schedule. Thank you for your patience!
Check out my lab book "Chemistry on a Budget" at amazon.com:
Each lab is presented with two possible report formats -- both labs use the same procedure page but each has a different conclusion page -- one with 10 questions to be answered as a conclusion, the other with a full laboratory report required. This gives the teacher the option of what type of report is desired!
I have a few links listed under Teaching Resources that could be very useful -- if you haven't checked it out, the link is at the top of this page! I just added one that has several Powerpoint presentations that you might find useful.
*I'd love to hear from you! Your feedback would really help me to focus on your needs. You might have a school vacation this week -- take advantage of the time and write me about your classroom experiences! There should be a "Contact" form below, or click on the "Contact" tab on the top right of this page.
Have a good end of the week!