Madi Wright
6
[email protected]
CSAS Center – ML 402
Wednesdays
1:35-2:25pm
CHEM 1002
Lectures:AcidsandBases1–3
Textbook:Chapter15&Chapter16
Topics:
• ThreeTheoriesofAcidsandBases
• StrengthsofAcidsandBases
• StrengthofOxoacids
• StrengthofCarboxylicAcids
• OrganicBases
• pH&pOH
Opener
(5minutes)
Whatiseveryonedoingforreadingweek?J
LastWeek (10minutes)
ShortAnswerQuestions (25minutes)
1.Compareandcontrastthethreetheoriesonhowtodefineacidsandbases.
2.Howcanyoutellwhatmakessomethingastrongorweekacid?Listsomeexamplesofstrong
acidsandstrongbases.
Madi Wright
6
[email protected]
CSAS Center – ML 402
Wednesdays
1:35-2:25pm
CHEM 1002
3.WhatistheconjugatebaseofNH3?
4.Whydoesputtinglemonjuiceoncookedfishmakeitsmellbetter?
5.WhyisHBrastrongeracidthanHCl?
6.WhyisHClO2astrongeracidthanHClO?Bespecific.
7.Nameeveryspeciespresentinanaqueoussolutionofthediproticsulfurousacid,H2SO3(aq).
8.Namethesaltthatcouldbeusedwithcarbonicacid(H2CO3(aq))tomakeanacidbuffersystem.
Madi Wright
6
[email protected]
CSAS Center – ML 402
Wednesdays
1:35-2:25pm
CHEM 1002
FormulaSheet!
(5minutes)
LongAnswerQuestions (30minutes)
1.Togetherthesalt;propylaminehydrochloride(C3H9NHCl)andthebase;propylamine(C3H9N,Kb
=5.1x10-4)createabufferedaqueoussolution.CalculatethepHofasolution,whichis3.00M
propylaminehydrochlorideand1.50Mpropylamine.
Madi Wright
6
[email protected]
CSAS Center – ML 402
Wednesdays
1:35-2:25pm
CHEM 1002
2.CalculatethepHandconcentrationsofallspeciespresentina1.00Maqueoussolutionof
triproticarsenicacid,H3AsO4(aq).Forthisacid,Ka1=5.6x10-3,Ka2=1.7x10-7andKa3=4.0x10-12.
[H3AsO4(aq)]
[H3O+(aq)]
[H2AsO4-(aq)]
[HAsO4-2(aq)]
[AsO4-3(aq)]
Closer:Up-comingmidterm!
rd
• Midterm2:FridayMarch3 • Mockmidtermwillbepostedonlineearlynextweek
• Take-up:WednesdayMarch1stat6:05-8:55pminSATHB
[OH-]
pH
(5minutes)