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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!