Download - Chemistry 12 Solubility Equilibrium II
Chemistry12SolubilityEquilibriumII
Name:Date:Block:
1. FormingaPrecipitate2. SolubilityProductConstant(OneSource
ofIons)FormingaPrecipitateExample:AsolutionmaycontaintheionsCa2+,Sr2+andZn2+.Howwouldyouprecipitatetheionsoutofsolutionindividually?Describeyouranswerusingaflowchart.
• Allarecations-thereforeanadditionofan_______________willprecipitateoutthesecations.
• Therearealso_______________________inthesolutiontohelpbalanceoutthecharge.
• WhatcanprecipitateoutCa2+?
• WhatcanprecipitateoutSr2+?
• WhatcanprecipitateoutZn2+?
• Whatneedstobeaddedfirst?
Asaflowchart:
Ca2+,Sr2+,Zn2+
Practice:1. Foreachofthefollowingsolutions,describeaprocesstoindividuallyremoveeachion.Besuretolist
thecompoundsthatyouaddinorder,andthemethodofremovingtheprecipitate.
a. Ag+Ba2+andBe2+
b. Br-,SO42-andS2-
c. OH-,PO43-andS2-
d. Cr3+,Ca2+andMg2+
HebdenWorkbookPg.90#26–36
SolubilityProductConstantKsp(OneSourceofIons)Inasaturatedsolution,equilibriumisestablishedbetweenthedissolvingandrecrystallizationofasalt.
AB(s)⇋A+(aq)+B-(aq) Keq=Ksp=Thesolubilityproductconstant,_________,isthe_______________ofthe_________________________________________ina________________________solutionraisedtothepowerofthecoefficientsintheequilibrium.
LabSimulation:Salts&SolubilitySolubilityCurves
Considerthegraphbelow:
a) Ifyouput40gofNH4Clin100mLofwaterat90oC,willyoubeabletoformasaturatedsolution?
b) ApproximatelyhowmanymoregramsofNH4Clcouldyouadduntilitis
saturated?
c) Ifyouput60gofKNO3into100mLofwaterat20oCandgraduallyheatthesolution,whatwillyouobserve?
d) Ifyoudissolve100gofbothNaNO3andKNO3in100mLofwaterat90oCandthencoolthemixtureto10oC,whichsaltwillformcrystalsfirst?
e) Ce2(SO4)3isanunusualsubstanceasitdoesnotfollowtheusualtrend.WhatisunusualaboutCe2(SO4)3?
Themolarsolubilityofasubstanceisthemolarconcentrationofasoluteinasaturatedsolution.
MOLERATIOWILLBEVERYIMPORTANTINTHISUNIT!!
WeneedtowriteouttheIONIZATION/DISSOCIATIONequationtofigureouttheratio.
Solubility=“s”
BaCO3(s)⇋____Ba2+(aq)+____CO32-(aq)Ratioofions:Ksp=Solubility=
Fe(OH)2(s)⇋____Fe2+(aq)+____OH-(aq)
Ratioofions:Ksp=Solubility=
Fe(OH)3(s)⇋____Fe3+(aq)+____OH-(aq)
Ratioofions:Ksp=Solubility=
Sr3(PO4)2(s)⇋____Sr2+(aq)+____PO43-(aq)
Ratioofions:Ksp=1.0x10-31Solubility=
Solubility(M)àKsp(1)ThemolarsolubilityofCaSO4is8.4x10-3Mataparticulartemperature.CalculateitsKsp.
• Whatistheequationrepresentingtheequilibrium?
• WritetheKspexpressionandsubstitutetheconcentrationofionsintotheKspexpression:(2)Thesolubilityoflead(II)chlorideis4.4g/L.CalculateitsKsp.(3)Astudentpreparesasaturatedsolutionbydissolving5.5x10-5molofAl(OH)3in500.mLofsolution.CalculatetheKspofAl(OH)3.(4)Astudentevaporated150.mLofasaturatedsolutionofmagnesiumphosphate.If0.16gofsoluteremains,calculatetheKsp.(5)CalculatetheKspofsilveroxalateifthesolubilityis0.033g/L.(6)Acompoundhasasolubilityof7.1x10-5Mat250C.AccordingtoitsKsp,thecompoundis:
A.CuS B.AgBr C.CaCO3 D.CaSO4
KspàSolubility(M)(1)Calculatethemolarsolubilityofiron(II)hydroxidefromitsKsp.(2)Calculatethemolarsolubilityofiron(III)hydroxidefromitsKsp.(3)Whichofthefollowingsubstanceshasthelowestsolubility? A.BaS B.CuS C.FeS D.ZnS(4)Howmanymolesofdissolvedsolutearepresentin100.0mLofasaturatedSrCO3solution? A.5.6x10-11mol B.2.4x10-6mol C.2.4x10-5mol D.2.4x10-4molWorksheet3.2HebdenWorkbookPg.95#42–55
IonizationEquationExtraPractice:- Representsthesaltbreakingapartintoions
o NaClà____Na++____Cl-- IfthesaltwereCaCl2
o CaCl2à____Ca2++____Cl-- Moleratiosrepresenttherelativeamountsofionsinsolution
NaCl(aq) à Na+(aq) + Cl-(aq)
1.0M
CaCl2(aq) à Ca2+(aq) + 2Cl-(aq)
1.0M Practice:
1. 0.25MKOH
2. 0.75MSrCl2
3. 0.20MNH4NO3
4. 0.45MAg2CrO4
5. 0.60MPb(IO3)2
6. 0.011MMg(OH)2
7. 0.45MBaCO3
8. 0.50M(NH4)2SO3