1. Launch: 1/26
Grab your binder and immediately take a seat!
Place launch paper and yesterday’s practice questions
on your desk.
Yesterday’s Exit Slip Data:
95%!
Today’s Objective: Review!
2. Launch: 1/26
Grab your binder and immediately take a seat!
Place launch paper and yesterday’s practice questions
on your desk.
Yesterday’s Exit Slip Data:
93%!
Today’s Objective: Review!
3. Launch: 1/26
Grab your binder and immediately take a seat!
Place launch paper and yesterday’s practice questions
on your desk.
Yesterday’s Exit Slip Data:
99%!
Today’s Objective: Review!
4. Launch: 1/26
Grab your binder and immediately take a seat!
Place launch paper and yesterday’s practice questions
on your desk.
Yesterday’s Exit Slip Data:
N/A
Today’s Objective: Review!
5. Launch 1/25
1. pH is a measure of
a. the taste of an acid or a base.
b. the ability of a solute to dissolve in solution.
c. the concentration of H+ ions in solution.
d. the strength of an ion in solution.
6. Launch 1/26
3. Of the four different laboratory solutions below,
the solution with the highest acidity has a pH of
a. 11.
b. 7.
c. 5.
d. 3.
7. Launch 1/26
5. How many times more
acidic is stomach acid than
rainwater?
a. 4
b. 10000
c. 40000
d. 100000
8. Announcements
Unit #6 Exam on Thursday!
No notecard!
Ask questions
Work with purpose
2 review days
Today is super important – study guide
Double points!
Tomorrow jeopardy
Class rules I am focusing on this week:
interfering with your own or someone else’s learning
leaving seat without permission
11. Review: Solutes vs. Solvent
A solution is a homogeneous mixture made up of a…
Solute Solvent
is dissolved does the dissolving
solid (or gas) liquid
molecules don’t move molecules randomly collide
Example: Example:
more
12. Review: How are solutes dissolved?
The dissolving process:
1. The solvent randomly collides with solute
2. The solvent overcomes the attraction between solute
3. The solvent surrounds the solute
13. Review: What is solubility?
Solubility is..
how well a solute dissolves in a solution.
Factors that affect solubility of solids
1. Temperature: temperature = solubility
2. Surface Area: surface area = solubility
more SA less SA
opposite!
Factors that affect solubility of gases
1. Temperature: temperature = solubility
2. Pressure: pressure = solubility
14. Review: Concentration Calculations
Concentration is…
the amount of solute in a solution.
g/L, mol/L (M), or ppm
There is a 3 step process for calculating
concentration: How many…?
or
1. Look at the ending unit
What is…?
2. Decide whether to multiply or divide
mol/L (molarity) or g/L divide
moles or grams multiply
3. Cancel units and do the math!
15. Examples
1. If 50g of NaCl is dissolved in 1L of H2O, what is the
concentration of the solution in g/L?
grams
50 g divided
1L = 50 g/L by liters
16. Examples
2. How many moles of NaOH are needed to prepare 2.0 L of
a 2 M solution?
2 M = 2 mol/L
2 mol 2 X 2 mol
2L x = = 4 mol
1L 1
17. Examples
3. 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 15000
1000 = 1000000
15,000ppm
18. Review: What are acids and bases?
“pH
Solutions can be classified as… scale”
Acids Bases
pH < 7 pH > 7
taste sour taste bitter
burn skin feel slippery
turn litmus paper red turn litmus paper blue
donate H+ ions accept H+ ions
19. Example
4. In the below chemical equation, identify the
reactant that acts like an acid and the reactant
that acts like a base.
HF + H2O F- + H3 O+
HF gives away an H+ (donates) = acid
gives turns into
takes an
H2O takes an H+ (accepts) = base turns into
away an H+
H+
20. Review: Strong vs. Weak
Strong acids/bases Weak acids/bases
fully dissociate partially dissociate
HCl H+ + Cl– HF H+ + F–
H+
H+ Cl- HF F-
H+
Cl- F-
H+
Cl-
HCl Cl
H +
H+
-
HF
F-
HF
H +
HF
F-
H+ H+
H+ HF
Cl- Cl- F- F-
strong acids and bases neutralize each other H2O + a salt
