Monday: Reviewed pH concepts from Friday’s homework, then did a chemActivity to learn the difference between Arrhenius and Bronsted-Lowery bases and definitions of conjugate acid/base. At the end we did a quick exploratory lab where you didn’t write anything down in a lab notebook. We measured the pH and concductivity of HCl, HC2H3O2 and water and compared the results. I asked, “Why is the pH for acetic acid always lower than HCl even though they are the same concentration? Doesn’t pH depend on concentration?” The answer led to a discussion of the difference between solubility and dissociation. SMART BOARD NOTES
Tuesday: We did a chemactivity to learn the difference between strong and weak acids. I gave a list of strong acids and bases you need to know as well as went over organic acids and bases. We also did problems where an acid reacts with a conjugate base of another acid and you learned how to figure out whether the forward or reverse reaction was stronger using a table of relative acid strength. SMART BOARD NOTES
Wednesday: Today we started with these questions. When going over those we defined polyprotic acids, monprotic and diprotic acids and showed how conjugate bases of diprotic acids can be amphoteric (act as both an acid and a base). The second half of class we did Ka and Kb calculations to determine pH w/ this worksheet. SMART BOARD NOTES
Thursday: Questions? Review! Then Quiz
Wednesday: Review for Ksp quiz. Should have been more organized here. Needed to go over how to do problems when given cocentration of one ion, but not the other (Common ion effect and fractional precipitation). Some spent time on lab and homework.
Thursday: Middle school science fair so some were judges others did misc stuff to help out
Science Fair Food Spreadsheet
Science Fair Food List of e-mails
HW: Video of pH: acids/bases , practice pH calculations w/ worksheet (video for worksheet, if you need it)
Notes to take:
- What is the auto-ionization of water?
- How are H+ and H3O+ related? Which one actually exists in water?
- What happens to the concentration of OH- ions when the H+ ions increases? Why? (Use LeChatelier)
- What happens to the concentration of H+ ions hen the OH- ions increase? Why (Use LeChatelier)
- Draw Z diagram and define acidic, basic and neutral solution
- Define Kw.
- At 25 C, what does Kw = ?
- What is [H+] and [OH-] in a neutral solution?
- How do you solve for H+ concentration when OH- is larger than 1×10^-7?
- How do you solve for pH and pOH?
- How do you solve for [H+] given pH?
How to complete pH/pOH worksheet from Maggie Wiseman on Vimeo.
Monday: Started Ksp packet, but only made it partway through.
Tuesday: The rescheduled turkey bowl
Wednesday: Did pre-lab for Ksp lab and did some more in Ksp packet
Thursday: Ksp lab. Spent first half of class going over how to use equipment. Needed to show you how to use burets and how to set-up labquests to collect data using Events with Entry.
Friday: More lab time. Everyone got in one more trial and most groups were able to start analysis.