Monthly Archives: January 2018

Lab 20G Parts 3 and 4

  1.  Do:  Part 3 for Lab 20G – find the molar mass of a weak monoprotic acid.
  2. Do:  Part 4 for Lab 20G – find the Ka of a weak monoprotic acid (HX).  You measured the pH of the acid (which is the equilibrium concentration of H+).  From the titration, you will find the initial molarity of the acid.  By knowing these two pieces of information, calculate the Ka of the acid.
  3. For extra help, you can get help from the TNT tutors.

One more review class!

  1.  Do:  Solubility worksheet – this is a really good review of the different types of questions you will find on your test next class.  See copy here:  Solubility Problems and Answer Key   Only look at the answer key AFTER you have tried the question!
  2. Ksp Test on Thurs Feb 1.  Here is an outline:   the test will cover all the sections after our last test, focusing on Ksp calculations.  You can expect to have at least one of each of the four types of problems we went over in the study guide, along with question about the common ion effect and titrations.  The test will be all written.  You will need a pencil and scientific calculator.
  3. If you have questions, work with the tutors in the TNT Club after school in Rm111 or 112 today (they’re great!) or with the SUCCESS tutors (Rm32).


  1.  Hand in Law of Reflection Lab if you didn’t last class.  For those who received feedback for their labs, you can do corrections and resubmit it.
  2. Demo:  The Case of the Reappearing Coin – how does a coin in an opaque cup that we cannot see, reappear when water is poured into the cup?
  3. Activity:  Refraction (using refraction blocks) Refraction Activity
  4. For Wed:  bring materials you want to use to prep for your sci fair presentation on Friday.  You can bring your display boards, paper, notes, etc…You can practice your oral presentation with other students.  I will supply scissors and glue sticks.
  5. Friday:  I will arrive around 8:15am so you can bring your projects in to set up (block 1) or put on the counter (block 2).  Bring your display board and visuals, your written report, your journal, and your oral presentation.

Lab 20G Parts 1 and 2

  1.  Hand in Lab 20C part 1.
  2. Do:  Lab 20G Part 1 to make a standard solution of oxalic acid dihydrate and Part 2 to standardize the NaOH solution.
  3. Do:  Find the molarity of oxalic acid you made.
  4. Do:  Find the molarity of the NaOH solution.
  5. Do:  have the prelab for Parts 3 and 4 ready for next class.

Ch4 Review

  1.  Hand in Lab 20C
  2. Go over ch4 review worksheet and do corrections.   See copy of answers here:  Ch4 Review Worksheet Answers
  3. Study!
  4. Test outline:  Major topics:  properties of solutions, molarity calculations, precipitate formation (memorize the solubility table!), types of reactions (ie. redox, metathesis).  Format:  about 20 mc questions and written section will include calculations and writing equations.

Law of Reflection

  1.  I will be able to prove the Law of Reflection
  2. Demo:  transparent, translucent, opaque
  3. Practice using protractors
  4. Activity:  Law of Reflection
  5. Begin reading section 5.1 and start the workbook pages for section 5.1
  6. Continue working on your science fair projects.  At this point, you should be completing your data collection and starting your written report.