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1 22 What Are Strong Acids And Bases
1. Launch: 1/22
Grab your binder and immediately take a seat!
Place launch paper and practice questions (Tuesday
1/19) on your desk.
Tuesday’s Exit Slip Data:
96%
Today’s Objective: I can define a Brønsted-Lowry acid and
base.
2. Launch 1/21
1. Which of the following is true about acids?
a. they taste bitter
b. they turn litmus paper blue
c. they have a pH of greater than 7
d. they taste sour and turn litmus paper red
3. Launch 1/21
2. Baking soda is an example of an
a. acid because it turns litmus paper red
b. base because it has a pH of about 8.5
c. acid because it turns litmus paper blue
d. base because it tastes similar to lemons
4. Launch 1/21
3. Which of the following solutions would have the
highest acidity?
a. pH 11
b. pH 9
c. pH 5
d. pH 2
5. Launch 1/21
4. Which of the following explains why Kool-aid
powder dissolves in water?
a. The Kool-aid powder is cold and therefore has a high
solubility.
b. The random motion of the solvent molecules causes
collisions with the solute molecules and dissolving
occurs.
c. The solute has strong intermolecular attractions and
is therefore easily dissolved.
d. The concentration of the solute is higher than the
concentration of the solvent and dissolving occurs.
6. Announcements
Missing work is due today
Check board for your name
Quiz tomorrow!
Short quiz – 15 MC
Lab questions due tomorrow!
Unit #6 exam moved to Thursday 1/28
9. What are strong acids/bases?
“break up”
Strong acids/bases…
fully dissociate in solution
HCl H+ + Cl– NaOH Na+ + OH–
H+ Cl- Na+ OH-
Hydrogen H+ Chloride SodiumNa+ Hydroxide
Cl- H+ ion ionOH- ion
H
Cl-
HCl Cl
+ ion
H+ -
Na
NaOH
OH -
+
Na+
Na+
OH-
H+ H+ all Na+
Na+
Cl- Cl- broken OH- OH-
up
10. What are weak acids/bases?
“break up”
Weak acids/bases…
only partially dissociate in solution
HF H+ + F–
HF F-
H+
F-
HF
F-
HF
H +
HF
F-
H+ partially
HF broken
F- F-
up
11. Summary
Strong acids/bases Weak acids/bases
fully dissociate partially dissociate
HCl H+ + Cl– HF H+ + F–
H+ Cl- HF F-
H
Hydrogen
+ H+
Cl- F-
H
Cl
HCl Cl
+ ion
-
H +
H+
-
F-
HF
HF
H +
HF
F-
H+ H+ H+ HF
Cl- Cl- F- F-
Video Summary
12. What are strong acids/bases?
What happens if you mix a strong acid and a strong
base?
HCl + NaOH ?
H+ + Cl- + Na+ + OH- ? 2O + NaCl
H
water salt
strong acid + strong base = water + salt
Neutralization
14. Exit Slip
1. Which of the following are properties of acids?
a. they taste bitter and turn litmus paper blue
b. they have a pH of less than 7 and turn litmus paper red
c. they have a pH of greater than 7 and taste sour
d. they usually feel slippery like soap
15. Exit Slip
2. The Bronsted-Lowry definition of a base is
a. a molecule that loses an electron
b. a molecule that has a pH of greater than 7
c. a molecule that donates hydrogen ions
d. a molecule that accepts hydrogen ions
16. Exit Slip
3. In the equation, H2O + HI H3O+ + I-, which
reactant molecule acts as the acid?
a. H2O
b. HI
c. H3O+
d. I-
17. Exit Slip
4. In the equation, H2PO4- + H2O H3PO4 + OH-,
which reactant molecule acts as the base?
a. H3PO4
b. OH-
c. H2PO4-
d. H2O
18. Exit Slip
5. Why could SO42- not act as a Bronsted-Lowry acid?
a. because it can donate O2- ions to solution
b. because it has no H+ ions to donate to solution
c. because it cannot accept any H+ ions
d. because it has a pH of 6