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Acids and Bases

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abby freo

on 4 June 2014

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Transcript of Acids and Bases

Acid in water
More ions greater
electrical current!
more H+ donated = stronger the acid = lower the pH
Water is both Amphitoric
When bases are added to water...
Bronsted-Lowery (1900's)
"Acids donate H+ (protons)" EX: HCl

"Bases ACCEPT H+ (protons)" EX: NH
Arrhenius (1850's)
"ACIDS DONATE H+" Ex: H PO

"BASES DONATE OH-" Ex: Mg(OH)
Bases donate OH-
TWO DIFFERENT
DEFINITIONS OF AN ACID & BASE
Acids and Bases
Acids donate H+

Dissolve completely
(more H+ released)
Very few dissolve
(less H+ released)
pH(0-3)
pH 0-3
pH 4-6.9
Acid ions Acid ions
Acids produce/donate H+ when placed in water
more hydroxides (OH-) =
more ions = stronger base
pH 11-14
Na OH Ca OH
OH-
OH-
OH-
OH-
OH-
Na+
Na+
Na+
Na+
Ca
Strong Base pH (11-14) Weak Base pH (7.1-10)
OH- donated
H+ donated
H O
2
H O
2
HCl H + Cl
Acid
NaOH Na + OH
+ -
+ -
Base
3 3
2
Limits bases to solely OH-
and must be in water!
3
WATER IS NOT NEEDED;
acid
must have a
base
Agenda for May 8, 2014
Strong vs. Weak Acid and Bases
Arrhenius vs. Bronsted-Lowery def.
Odds in packet for Arrhenius/B.L. WS
Conjugate Pairs
Conjugate Acid= acid formed from a base
Conjugate Base= base formed from an acid
donor acceptor
NH + H O OH + NH
3 2 4
- +
H+
Base

Acid

Con B

Con A
(can accept H+ now)
(can donate H+ now)
Agenda for May 9
1) Go over Arrhenius/Bronsted-Lowery Ex - 5 min
2) Nomenclature notes "naming"- 15 min
3) Naming WS and Bronsted-Lowery practice (5th stamp)
pH indicators
substances that tell you the pH of a solution by changing colors.
substance with a red color has more H+ dissolved in solution than an orange color
What happens to the pH when a

is added to an

?

Base
Acid
...the pH will change
high
amt
H+
very low
amt H+
Neutralization occurs when there is the same
amount of H+ and OH- in a solution;
pH = 7

Acids
Bases
Neutralization Equation:
Acid (+H)
+
Base (OH-)

H O
+ ionic compound (salt)

2
Ex: adding
phosphurous (-ite) acid
to
barium hydroxide
produces a neutralization reaction

H
PO + Ba(
OH
)
H O
+ Ba (PO )

3 3 2
2
3 3 2

pH=7
Ba PO
3
+2 -3
*Then balance (polyatomics 1st; must be on both sides)
ORGANIC INDICATORS
Agenda for May 12, 2014
1) Make sure you get stamped for Acid/Base Naming and Notes (2 stamps)

2) Indicators and Neutralization Reactions Notes

3) Neutralization WS (stamp)
QUIZ WED!!!
Arrhenius
Bases
Any
Acid
Agenda May 13, 2014
1) Grab a calculator
2) pH/pOH, calculating H+ and OH- concentrations
3) pH and pOH WS
Open Note Quiz Thurs...Lab tomorrow
Agenda for May 16, 2014
1) Go over quiz
2)

Catch up day (7stamps) - keys on the wooden table
3)
ABSENT FOR ACID/BASE pH LAB??? Come get the results from me.
4) Missed the open note quiz??? Your taking it today!
5) Failing Students: 2 weeks left!
online semester quizzes "yes I meant plural":
tinyurl.com/sheptonquiz4
tinyurl.com/sheptonquiz5
DUE May 24th
Agenda for May 23th
1)STAMP ACID & BASES UNIT NOW -
no late stamps

(I'm going over the answers.)

2) 1st 5 min checking the key (NO PHONES!!!)

3) Working on
Gas and States of Matter Unit - Due Tues
***ONLINE QUIZZES DUE ON 5/24 tomorrow
at 5pm(sat)
tinyurl.com/sheptonquiz4
tinyurl.com/sheptonquiz5
Agenda for May 30
1) STAMP Stoich NOW
2) Look over stoich(5 min ...NO PHONES)
3) Working on unit in semester packet (stamp)
Late Grade on quiz (max 50) : tinyurl.com/sheptonquiz4
tinyurl.com/sheptonquiz5
Failing for semester??? day left to make-up/retake an assignment
1
Study Hall
Exam
1) Independent REVIEW: tinyurl.com/sheptonchemvideos
2) You may review, listen to music, read or sleep!
3) Locker clean out at 10:24am (must be at your assigned locker)
1) Must have your
EXAM REVIEW!!!
2) All personal belongings must be placed on the lab tables.
3)
No ELECTRONIC DEVICES
until
5 testers
remain.
4) Keep your self busy until then.
Full transcript