Lecture of 3 February 2020Outline of today's lecture

Midterm distributed on Wednesday•Solubility product•pH, CO2 and CaCO3 problems•

Solubility product

Mz Xy solid 2 Mittag t y XFag

at saturation molested in solutes

KspCM CX Yso.li MFcxjY

at saturation Ca 2 SX ys

Ksp Cz ys t

S fKs ZyY

Cl Temperature solubility generallyincreaseswith temperature OH o

2 common ion effect

Basoy Batt e Sdf Ksp 1.1 10

s co 5Madd Back at 0.01M

if soya S then Bath S 0.01M

l Ksp CBA soy'T Stol s Soyo 8M

the presence of a common ion generallydecreases the solubilityofthe other con

3 ionic strength through activity coef

KIS Ata 2 42 C TI Ctc 82as I uncreens rt decreasesS increase salting in

solubility 5 a goodway tomeasure TIrE see

4 pH if oneof cons 5 a weekacid or bare

Caco Ca t 5

COT t H f Hadj ka attHadj

Ksp It last lecture192

Z

pH of solution with CO2 in equilibrium with Caco

CO2 aq Kit Poo Kit O 035Ka 4.25 0

7

Hoos Fifty Haq Kaz 5.01 10Kai Ksp 4.57 10 9KHPaz

Coy kqgIk

cageyKspCHxg2

Cath tspka KartaRo

chargebalance Ht 2CCa Colt Jt Itai 265

Cody CHEO ag Htt Haj

typically CG't co dominate

so chargebalance 2 Cat Hadj

2KspCHtJLHS RHScations ka ka k p

FIT Panion

Ht fkaizkag.tt J's

P 4xco 4atm Itt 5.79 10 914

pit 8.2.37 Cuexact 8.236 J

graphical solution

26 2 CHAE RHs anionsO02M

2Catyt if LHS cations001MKaty I

i l9.2

8.2Tcations Anton's

Corc Gag charge balance 2cg't Hoo

CortGCOsc NaOH charge balance at t2CaH Haq

approxexactapprox Htexact Cat

4

pH of saturated GCO Cao Con

Caco Ca t COTCOT t Hao E Hadj t 0 H Jtotal dissolved carbonate species

1 Ct Cco neglectaat highpH

Caitchargebelance 2 Can't tC z Colt kata It

may balance 24 2 Ctcoj t co

agebalance Cata 2C a C0H t H65 t2Ccojco E Hwi

Ksp Cca't co Hoo Cues3 CoE

CH Wj Colt kwh g Iwi s E ut k

Kspk 15 it'E

Ht 1.16 10 p It 9.93 s

pHof aqueous solaratmospheric CO2 as a function of coz

nocozpaco 2 pressure in presence

andabsenceof saturated8.2 CacozpHnon.gs

J6tcaco3I5Y fp natmCoco

I thEF

buffering properties of Gcog satd so In

remits changein pH on adding acid Ltd

Nat 2 catty Ht Oct Hoo 1124057 6 1A qaddingbase oddsHq

Cacog bufferingeffects ofConcord

Cocos antacidproperties

6