Today we started with a quick review of what a buffer is and how to identify one.
Today we started with the titration simulation so that you could see that not all equivalence points will be at a pH of 7. We talked about why that happens for weak acids and bases (its because of their conjugate that is present at the equivalence point). We identified the buffering region and then you all spent the rest of class working in groups drawing molecular level pics of 4 parts along a titration curve on big paper.
Test on Acids/Bases: Monday
Today we worked titration problems – how to find pH at equivalence point, buffer region, etc.
Today we did the indicator lab. HW was a google classroom assignment on the subject.
No school, end of quarter grading day.
Today we started with some warm-up questions, reviewing Ka problems. Then we did the salt hydrolysis exploration lab in which each person tested two ionic compounds to see if they made the pH change. Here are the results.
The rest of class we worked on understanding what happened in the lab and explaining it. At this point you should be able to take an ionic compound (a salt), write the hydrolysis reactions for each ion and determine if it will form a neutral, acidic or basic solution. Here’s the notes.
Today we reviewed a bit from yesterday, went over the term amphiprotic, the meaning of Ka1, Ka2, Ka3 for polyprotic acids. The rest of class you spent working on ChemActivity 47 in the packet. Here’s the answers.
HW: finish chemactivity 47 (the exercises on last page) + textbook problems.
We started with a Buffer Demo to show you what a buffer does and then we watched an online simulation to see how it works at the molecular level. Next we worked through the new packet’s outline of notes and made it to the page where you had to identify buffer systems and give an approximate pH.
Continued with Buffer notes and problems.
No class b/c I was at a textbook adoption meeting
MLK’s birthday. No school.
Worked on page 12 in the packet – lots of questions, will review tomorrow.
HW: textbook problems
Reviewed all of the acid/base concepts we have learned so far. Learned 7 strong acids to memorize. Here’s the notes from today. Set up for half titration lab.
pKa from half titration lab
No school for inauguration.
Ksp Lab. First half we did pre-lab. Then everyone set up the lab, but few got in a trial.
Goal: to get 2 trials of data and do calculations.
HW: lab report
Review for test. Focus on Ksp by working on 17.15 to 17.55 (odd).
Equilibrium and Ksp test
Start Acid/Base unit. Review pH and pOH, learn definitions of acids using Chemactivty 42, distinguish between strong and weak acids, chemactivity 43.
Review of some concepts we learned before break. Started with pg 25 and 26 in the packet. Then I used this simulation to review LeChatelier’s principle. To practice you did the problems on page 30 in the packet.
HW is to finish the LeChatelier Lab Q’s if you haven’t as well as do pg 35 in the packet.
Review K & Q problems (ICE tables). Notes on Kc vs Kp – mainly how to convert from one to the other. Equilibrium practice (rest of packet).
Solubility equilibrium – spent most of class working through first page of new solubility packet. Then I lectured on what solubility limits and the difference between saturated, unsaturated and supersaturated w/ some demos. Here’s answers to first page and some notes. Here’s answer to whole packet.