arrhenius acids and bases
DESCRIPTION
Arrhenius Acids and Bases. Question of the Day: Which are acids? Which are bases? How can you tell?. Arrhenius Acids. A substance whose water solution contains H + as the only positive ion. Cl. Cl -. H. +. H +. HCl H + + Cl -. - PowerPoint PPT PresentationTRANSCRIPT
#8.2 Aim:
What are Arrhenius acids and
bases?
AgendaQOD (5)
Lesson: Arrhenius
theory (15)
Activity:Drawing acids and
bases (15)
Summary (5)
HW#17
Arrhenius AcidsA substance whose water solution contains
H+ as the only positive ion.
HCl H+ + Cl-
ClH Cl- H++
Does that mean that all compounds that contain H are acids?
Nope! CH4 does not release H+ in water
#8.2 Aim:
What are Arrhenius acids and
bases?
AgendaQOD (5)
Lesson: Arrhenius
theory (15)
Activity:Drawing acids and
bases (15)
Summary (5)
HW#17
Nothing!
Properties of acids are properties of the hydronium ion (H3O+)
H+ + H2O H3O+
H+ OH
H+ O
H
HH +
An H+ ion and a proton are the same. (Both have one proton, no neutrons, and no electrons).
What’s the difference between an H+ ion and a proton?
Rewriting the dissociation of HCl in H2O
HCl H+ + Cl-
ClH Cl- H++
HCl + H2O H3O+ + Cl-
HCl-
H
H
+ O OH
H
H+ Cl-
+ -
#8.2 Aim:
What are Arrhenius acids and
bases?
AgendaQOD (5)
Lesson: Arrhenius
theory (15)
Activity:Drawing acids and
bases (15)
Summary (5)
HW#17
properties of bases are properties of the hydroxide ion (OH-).
Are all compounds containing OH’s bases? Nope!
CH3OH is not a base.
Arrhenius BasesA substance whose water solution contains OH- as
the only negative ion.
NaOH
Na+ OH-
+
NaOH Na+ + OH-
#8.2 Aim:
What are Arrhenius acids and
bases?
AgendaQOD (5)
Lesson: Arrhenius
theory (15)
Activity:Drawing acids and
bases (15)
Summary (5)
HW#17
-
Some bases do not look like bases until you put them in water…
NH3 + H2O NH4+ + OH-
O
HHH
H
H
N + NHH
HHO
H
+
NH3 ?
#8.3 Aim:
How do we name acids and
bases?
AgendaQOD (5)
Lesson: Acid
strength (10)
Naming acids and
bases (10)
Activity:Acid and
base strength
(15)
Summary (5)
HW#18
Acid/base strengthThe more ions released in solution, the stronger
the acid or base
H+
H+
H+
H+
H+
H+
Cl-
Cl-Cl-Cl-
H+
H+H+
Strong acids/bases create many ions
-Complete Reaction
HH
H
XX
XX-
H+
Weak acids/bases only create a small percentage of ions
-Reversible Reaction
Which is a strong acid?
#8.2 Aim:
What are Arrhenius acids and
bases?
AgendaQOD (5)
Lesson: Arrhenius
theory (15)
Activity:Drawing acids and
bases (15)
Summary (5)
HW#17
So how can you tell if a substance is an Arrhenius
acid or base?Put it in water and see what ions are released!
OR…
Look at Table of Acid and Base Strength
#8.2 Aim:
What are Arrhenius acids and
bases?
AgendaQOD (5)
Lesson: Arrhenius
theory (15)
Activity:Drawing acids and
bases (15)
Summary (5)
HW#17
Check for understanding:
According to Arrhenius theory of acids, citric acid in oranges and acetic acid in vinegar are classified as acids because their aqueous solutions contain
1. hydrogen atoms2. hydrogen ions3. hydroxide atoms4. hydroxide ions
#8.2 Aim:
What are Arrhenius acids and
bases?
AgendaQOD (5)
Lesson: Arrhenius
theory (15)
Activity:Drawing acids and
bases (15)
Summary (5)
HW#17
Check forUnderstanding:
When an Arrhenius base is dissolved in H2O, the only negative ion present in the solution is
1. OH-
2. H3O-
3. H-
4. O2-
Activity: Acids and basesEach pair will be given two substances. For each, use your reference
table along with your notes to follow each step:1. Is your substance an acid or a base?2. What kind of ions will its water solution contain? 3. Draw what will happen to your acid or base when you put it in
water.For example…
#8.2 Aim:
What are Arrhenius acids and
bases?
AgendaQOD (5)
Lesson: Arrhenius
theory (15)
Activity:Drawing acids and
bases (15)
Summary (5)
HW#17
#8.2 Aim:
What are Arrhenius acids and
bases?
AgendaQOD (5)
Lesson: Arrhenius
theory (15)
Activity:Drawing acids and
bases (15)
Summary (5)
HW#17