How to Calibrate the pH Sensors
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Learning Goals
- Given any of the four pH, pOH, [H+] [OH-], calculate the other three WITH OR WITHOUT a graphing/programmed calculator.
- Explain why the [H+] of a strong acid solution comes from the initial concentration of the acid while the [H+] of a weak acid solution requires an equilibrium calculation.
- Write the Ka expressions for weak acids using correct symbols for all quantities.
- Solve “RICEE” problems involving acid equilibria.
- Correctly use the “x is small enough to ignore” approximation when appropriate.
Agenda
- Bell Ringer
- You need an acidic and a basic partner. Please determine your partners now and be ready to go to lab and determine lab stations when the bell rings.
- You need your lab composition book. Look up what is required for demo write-ups.
- Where are you on your U9 I Can? Read through it now and talk with your station buddies.
- Watch the video (also from your playlist) to see how to calibrate the pH sensors.
- Housekeeping
- Syllabus and safety agreement
- GC - DISABLED. If you get your schedule changed, you will have to see me to change GC classes.
- Paper Towels
- Posted grades - the "A" we discussed.
- M.O.M. demonstration and discussion, Part 1
- Lab Check-in
- NEW! Balance room for analytical balances
- Lab station check - acidic/basic
- 1/2 Block - Glassware 1, Hardware, Balances - Stations 1-10
- 3/4 Block - Glassware 2, PASCO, Other - Stations 1-10
- Common Area and individual clean-up responsibilities
- M.O.M demonstration and discussion, Part 2
- Pre-Lab - Ka by Half-Titration
- Calibrating pH sensors
- Submitting/Completing pre-lab
- Scoring
- Work Day
Big Ideas
- Big Idea 3: Changes in matter involve the rearrangement and/or reorganization of atoms and/or the transfer of electrons.
- Big Idea 6: Any bond or intermolecular attraction that can be formed can be broken. These two processes are in a dynamic competition, sensitive to initial conditions and external perturbations.
