Launch: 1/14   Grab your binder and immediately take a seat!

  Place launch paper and HW (Tuesday’s 1/12 practice questions) on your desk.

  Yesterday’s Exit Slip Data:

  Today’s Objective: I can calculate the concentration of a solution in terms of parts per million (ppm).

91%

Launch: 1/14   Grab your binder and immediately take a seat!

  Place launch paper and HW (Tuesday’s 1/12 practice questions) on your desk.

  Yesterday’s Exit Slip Data:

  Today’s Objective: I can calculate the concentration of a solution in terms of parts per million (ppm).

87%

Launch: 1/14   Grab your binder and immediately take a seat!

  Place launch paper and HW (Tuesday’s 1/12 practice questions) on your desk.

  Yesterday’s Exit Slip Data:

  Today’s Objective: I can calculate the concentration of a solution in terms of parts per million (ppm).

90%

Launch: 1/14   Grab your binder and immediately take a seat!

  Place launch paper and HW (Tuesday’s 1/12 practice questions) on your desk.

  Yesterday’s Exit Slip Data:

  Today’s Objective: I can calculate the concentration of a solution in terms of parts per million (ppm).

90%

Launch 1/14 1.  Concentration is

a.  a way to describe the motion of solvent particles in a solution.

b.  a measure of how quickly a solute dissolves. c.  a number that can be measured in g/L or mol/L. d.  how well a solute dissolves in a given amount of solvent.

Launch 1/14 3.  If 18 mol of NaCl is dissolved in 9L of water, what

is the molarity of the solution in mol/L? a.  .5 mol/L b.  2 mol/L c.  3 mol/L

d.  162 mol/L

Launch 1/14 4.  What is the molarity of a solution that has 20

moles of HNO3 dissolved into 5L of water. a.  2 M b.  4 M c.  20 M

d.  100 M

Launch 1/14 5.  How many moles of NaOH are needed to make

10L of a 5M solution? a.  .5 mol b.  2 mol c.  25 mol

d.  50 mol

Announcements   The semester ends next Friday

  Quiz tomorrow – 25 questions   Take home notes/practice questions and study hard!

  Look at exit slips online!

  Quiz next Friday

January Calendar

What is concentration? – Part III

Mr. Heffner 1/14/10

What is concentration?   Concentration is…

  the amount of solute dissolved a in solution.

  Concentration is measured in… 1.  grams per liter (g/L) 2.  moles per liter (mol/L)

What is concentration?   Concentration is also measured in…

3.  parts per million (ppm)   the # of solute particles dissolved in 1,000,000 solvent particles

# solute particles 1,000,000 solvent particles

Examples 1.  A solution of salt water contains 15 grams of salt per

1,000 grams of water. What is the concentration in parts per million (ppm)?

15 1000 = ?

1000000

15 1000 = 15

1000000 000

15,000ppm

Examples 2.  A solution of sugar water contains 300 grams of sugar

per 10,000 grams of water. What is the concentration in parts per million (ppm)?

300 10000 = ?

1000000

300 10000 = 300

1000000 00

30,000ppm

Examples 3.  What is the concentration in parts per million (ppm) of a

solution of salt water that contains 2 grams of salt per 100,000 grams of water?

2 100000 =

? 1000000

2 100000 =

2 1000000

0

20ppm

Examples 4.  A solution of salt water contains 395 grams of salt per

1000 grams of water. What is the concentration in parts per million (ppm)?

395 1000 = ?

1000000

395 1000 = 395

1000000 000

395,000ppm

Review: Solutes vs. Solvent   A solution is a homogeneous mixture

  Solute = is dissolved, a solid (or gas), doesn’t move   Ex: salt

  Solvent = does the dissolving, a liquid, moves randomly   Ex: water (polar solvent)

Review: How are solutes dissolved?   In a solution…

1.  The solute (solid) is attacked by the solvent (liquid) 2.  Solid-solid attractions are overpowered by the liquid

3.  The solute is surrounded = dissolved

Review: What is solubility?   Factors that affect solubility of solids

1.  Temperature: temperature = solubility 2.  Surface Area: surface area = solubility

  Factors that affect solubility of gases 1.  Temperature: temperature = solubility 2.  Pressure: pressure = solubility

more SA less SA

Review: Concentration Calculations   If the question asks for:

  g/L or mol/L or molarity divide   grams or moles multiply

  ppm ratio

  M = molarity = mol/L

Solutions Rotations   Directions:

  Pick a question and write it down   Solve showing all work

  When finished, Mr. Heffner will come around to stamp your work

  Rules:   If you pick it, solve it

  Only one card at a time   Show your work!   Work together

Homework   Study for the quiz!