Announcements

1
Announcements

• To join clicker to class today
• Turn on the Clicker (the red LED comes on).
• Push Join button followed by 20 followed by
  the Send button (switches to flashing green LED
  if successful).

• Scores recorded for you (except for lab) are
  posted in D2L.
• Reminder Grading scale in chemistry is different
  from high school.

• No quiz today, just worksheet.
• Note that we are skipping parts of Chapter 5.
  See the reading assignment.

2
Review

• How we quantify what is dissolved in solution
• Mass solute/mass soln (mg/kg ppm, etc)
• Molarity (M) mol solute/L soln
• Calculating amount of solution necessary to get a
  particular amount of solute.
• Converting between mass/mass and molarity units.
• 1) convert mass solutegt moles solute
• 2) use density to convert mass sol'n to L sol'n.

3
Concentration Unit Conversions

• What is the ppb of Cl- in a 0.050 M CaCl2
  solution?
• Solution density 0.995 g/mL
• MM(Ca) 40.08 g/mol
• MM(Cl-) 35.45 g/mol

4
Effect of Osmosis on Blood Cells

• Mathematics of Osmosis
• ?MRT, M molarity of solute particles, R gas
  constant 0.08206 Latmmol-1 K-1, T
  temperature in K.