Summary IB Chemistry Topic 9/19 Redox Processes

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⑧HIAWATHA * WEINHEIM
Reduction
Znsoycaqytlucs,
°
Oxidation
Znisjtlusoqcaq,
0 °
→



loss gain e-
•


displacement metal of less reactive metal
•
e- rxn : more reactive displaces
•
ions

loss H It
gain
• •




0 loss 0
gain
• •




•
tinoxi .
state
•
doxi .
state


reducing agent oxidizing agent
•
•




Disproportionation Batanceredoxeqslinaeidie solutions )
• •




•

hedoxinuhich / species is oxidized and reduced at sometime •
add e- H2O ,
Ht
,



2Hz02(aq, →
242%1+029, botheq #
•
•
-

same es
ti -
I 1- I -2 c




0AA-ivity-en.es WinklerMethod__
°




•
top :

strong reducing agents oxidized determine concentration of dissolved in water sample
readily oxygen a
•
mote
-




bottom less oxidized biochemical ( BOD)
tveakreduuing agents readily Measure
• •

demand
oxygen
: -




used to predict ifa displacement reaction wikoaur
102-74520--2
• • -




tmoutiveifitbasmesionspomsolid two sample water cslluted
•

one
immediately tested
•


sample
-




•

norxnif solid metal dreoutuiethanaqions 1021 +
selsndsamplestoredindarkfor 5 days atbhstant

•
metals freakin than It will displace # ions from temp + after 5 days 1021 determined
solution to form
Helgi •


steps :




this)t2Hdcaq→ Znclzcaq , + Hug,
"
•



molszoz
-




1000mg -1g -




↳ this
)t2HYaq , -72h "(aq Hzcg , ,
+ -

Moltz → mass 02
Mdma ppm
=




Metals trait've thank cshctz
• -
-


norxn

" " ""
↳
Cnisitltcliaoptnorxn
-

BOD -

-



intima ] -


finally] 5.3111:÷yaean%f"p?iiIe%


°Redoxratin
" " Potassium manganate
Fe oxidized to Fe oxidizing agent
•
determines csnc .


of an analyte containing either
•


by an "
dichromate

Felt Fest + g-
reducing agent
↳

oxidizing
an or -2



Steps
•

① moloftlnoy ln=cI ② motte Fe
-




find amount of Fein
→ mass
sample
•


a

③ mmTnampeHN%