TODAY'S OBECTIVES

Student can...

• Student can determine amount of solute and solvent needed to make a specified concentration

CLASS LESSON

1. All students should complete ALL of BLUE worksheet "Types of Solutions and Their Effects of Cells"-notes and questions! before next class.
2. C block students set up osmosis experiment:
   1. Assign students to make specified concentration of assigned solute in water:
      1. solute options:  starch, salt (NaCl) or sugar (sucrose)
      2. concentration options: 1 g/L, 5 g/L, 20 g/L
   2. Students make small volume of solution
      1. Assigned solution is in g/L but the thistle tube is only ~ 20mL so they should make smaller volume (like 50 mL or 75 mL)
      2. Students should each determine how to figure out the mass of solute and the volume of solvent.
      3. Demonstrate how to fill and seal thistle tube
      4. Students should use filtered water (to reduce issues of impurities and ions)
      5. Place filled thistel tube submerged in pure water
      6. Mark height of water in thistle tube with wax pencil
      7. [this exercise will tax their understanding of volume and concentration - but this will help them to understand the principle and the calculations!]
      8. Use plastic thermometer holders to support thistle tubes in beakers.
      9. Label and set aside till next day.
   3. Every student (in C block) should email <reimerj@gsis.sc.kr>
      1. identify the concentration and solute you were assigned (eg. 3g/L NaOH)
      2. identify the amount of solute you put in solution (units intentionally left unspecified)
      3. identify the amount of solute you put in solution (units intentionally left unspecified)
      4. This exercise indicates which students understand the concept and which students did not understand what they were doing.
3. B block students-
   1. Practiced "Concentration Review" in class.
   2. Assignment:
      1. Complete all of blue handout
      2. Answer textbook questions p189 in hard copy.

ASSIGNMENT