4.appliedlechat.ppt

7/24/2019 4.appliedlechat.ppt

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AppliedLe Chatelieir's

Principle

Lesson 4


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Lab 19A

Le Chateliers Principle

Copy the five Equilibrium Equations into your lab handout


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Part I

Thymol Blue (blue) + H+ ThymolBlue (yellow)


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Fe3+

(aq) + SCN-

(aq) FeSCN2+

(aq)

yellow brown

Fe3+(aq) + 3OH- Fe(OH)3(s)

Part II


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Co(H2O)2+ + 2Cl- Co(H2O)!Cl2

2- +

2H2O(l)"#n$ blue

Part III


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%ner&y + 2CrO!

2- + 2H+ Cr2O

'

2- +

H2O(l)yellow oran&e

Ba2+ + CrO!2-

BaCrO!(s)

Part IV


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Cu(H2O)42+ + 2H!

Cu(OH)2(s) + 2H4+ + 2H2O

li"ht blue po#der blue

Cu(OH)2(s)+ 4H! Cu(H!)42+ + 2OH$

po#der blue %iolet

Part V


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Application o& Le Chateliers Principle

ner" + 2CrO42$ + 2H+ Cr2O

2$ + H2O(l)ello# oran"e

*no# the &ollo#in"

Any acid is H+

Any baseis OH$

Acidsreact withbasesH+ + OH$ , H2O(l)

-tress -hi&t .CrO42$/ .Cr2O

2$/ colour

Add H+

Add CrO42$

Add Cr2O2$


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*no# the &ollo#in"

Any acid is H+

Any baseis OH$



2$/ colour

Add H+

Add CrO42$

Add Cr2O2$


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*no# the &ollo#in"

Any acid is H+

Any baseis OH$



2$/ colour

Add H+

Add CrO42$

Add Cr2O2$


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*no# the &ollo#in"

Any acid is H+

Any baseis OH$



2$/ colour

Add H+ ri"ht decrease increase oran"e

Add CrO42$

Add Cr2O2$


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*no# the &ollo#in"

Any acid is H+

Any baseis OH$



2$/ colour


Add CrO42$ ri"ht increase increase 0

Add Cr2O2$


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Application o& Le Chateliers Principle$1



*no# the &ollo#in"

Any acid is H+

Any baseis OH$



2$/ colour


Add CrO42$ ri"ht increase increase 0

Add Cr2O2$ le&t increases increases 0


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2$/ colour


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2$/ colour

Add aOH


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aOH , a+ + OH$


2$/ colour

Add aOH


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aOH , a+ + OH$

spectator ion stress ion$lo#ers H+


2$/ colour

Add aOH


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aOH , a+ + OH$

spectator ion stress ion$lo#ers H+


2$/ colour

Add aOH le&t increases decreases ello#


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aCrO4has lo# solubilit

aCr2Ohas hi"h solubilit


2$/ colour

A i i & C i i i 1


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2$/ colour

a(O!)2

A li i & L Ch li P i i l 1


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aCrO4has lo# solubilit$ a2+reacts #ith CrO4

2$

aCr2Ohas hi"h solubilit$ no reaction

a(O!)2 , a2+ + 2O!$


2$/ colour

a(O!)2

A li ti & L Ch t li P i i l 1


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a(O!)2 , a2+ + 2O!$

stress spectator


2$/ colour

a(O!)2



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a2+reacts #ith this ion



a(O!)2 , a2+ + 2O!$

stress spectator


2$/ colour

a(O!)2



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a2+reacts #ith this ion



a(O!)2 , a2+ + 2O!$

stress spectator


2$/ colour

a(O!)2 le&t decreases decreases ello#



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2$/ colour

HCl



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HCl , H+ + Cl$


2$/ colour

HCl

Application o& Le Chateliers Principle 1


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HCl , H+ + Cl$stress spectator


2$/ colour

HCl



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HCl , H+ + Cl$stress spectator


2$/ colour

HCl ri"ht decreases increases oran"e



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Application o& Le Chateliers Principle$ 2

ner" + Co(H2O)32+ + 2Cl$ Co(H2O)4Cl2

2$ + 2H2O(l)pin blue

-tress stress ion spectator ion shi&t colour

HCl



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HCl , H+ + Cl$


HCl


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Application o& Le Chatelier s Principle$ 2

Co(H2O)32+ + 2Cl$ Co(H2O)4Cl2 + 2H2O(l)

pin blue

HCl , H+ + Cl$spectator stress


HCl Cl$ H+ ri"ht blue



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5ncrease te6perature



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5ncrease te6perature



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7 te6p none none ri"ht blue



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A"O!



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A"O! , A"+ + O!

$


A"O!



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Application o& Le Chatelier s Principle 2



A"O! , A"+ + O!

$

7stress$ lo# solubilit (data boo$4) #ith Cl$


A"O!



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Application o& Le Chatelier s Principle 2



A"O! , A"+ + O!

$

7stress$ lo# solubilit (data boo$4) #ith Cl$


A"O! A"+ O!

$ le&t pin

Here is a the first question from your lab I will give you a good answer


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Here is a the first question from your lab. I will give you a good answer

so that you understand the level of detail that is required in the response

. E!plain the colour changes observed when "e#$%&'

&( )*C$( and

$a%H were added to the thiocyanatoiron equilibrium system.

*tart by writing the equilibrium equation.

8e!+(a) + -C$(a) 8e(-C)

2+(a)

ello# bro#n

Adding 8e(O!)

!increasesthe .8e!+/and causes the reaction to shift

ri"htand turn bro#n.Adding *-Cincreases the .-C$/and causes the reaction to shift

ri"htand turn bro#n.

Adding aOHincreasesthe .OH$/which reacts with 8e!+( lowering the

.8e!+/causing the equilibrium to shift le&tand turn ello#.

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4.appliedlechat.ppt