AI-xRlINIw
HachDigitalTitrator:Phenolphthalein
and TotalAlkalinity
A.
Equipment:
1.
Digitaltitrator
2.
Deliverytubes(1720500)
(14389-01)
3.
SulfuricAcidDigitalTitratorCartridge
4.
Phenolphthalein
PowderPillows(942-99)
5.
RedPowderPillows(943-99)
Bromcresol
Green-Methyl
6.
Other:
watercollection
container
a.
100-mLgraduated
cylinder
b.
flask
c.
250-mLErlenmeyer
water
d.
deionized
e.
stirplate
B.
U SE :
1.
Measuring
Alkalinity
a.
Collectabout200- 500 mL of samplewater,andallowit to warmor cool
to nearroomtemperature.
b.
Rinseall neededglassware
oncewithsamplewater.
c.
Assembledigitaltitrator,titrationcartridge,and deliverytube.
d.
Withthe assembled
titratorin an upwardposition,
turnthe deliveryknob
air bubblesin the
to ejecta few dropsof titrant,whichwilleliminate
deliverytube. Resetthe counterto zero.
e.
measureout 100mL of sample
Usingthe 100-mLgraduated
cylinder,
flask.Placea stir
water,thentransferthisto a clean250-mLErlenmeyer
bar intoflask.
f.
lndicatorPowderPillow(PIPP),
Addthe contentsof one Phenolphthalein
setflaskon stirplate,
andswirlthe solutionto mix.
g.
end
lf the solutionturnspinkwhena PIPPis added,titrateto a colorless
point. Do thisby placingthe deliverytubeintothe solution,andslowly
turningthe deliveryknob. Recordthe numberof digitsrequiredandgo to
step8.1.h. lf solution remainscolorless(i.e.,does not turn pink)
when the PIPPis added,proceedto step B.1.i.
h.
Calculate:
DigitsRequired
x 1 = mg/LCaCO,Alkalinity
i.
Green-Methyl
Red IndicatorPowder
Add the contentsof one Bromcresol
mixon stirplate.Solutionwillturna
Pillowto theflask,allowto thoroughly
greenishbluecolor.
AI-xRlINIw
HachDigitalTitrator:Phenolphthalein
and TotalAlkalinity
A.
Equipment:
1.
Digitaltitrator
2.
Deliverytubes(1720500)
(14389-01)
3.
SulfuricAcidDigitalTitratorCartridge
4.
Phenolphthalein
PowderPillows(942-99)
5.
Red PowderPillows(943-99)
BromcresolGreen-Methyl
6.
Other:
watercollection
container
a.
100-mLgraduated
cylinder
b.
c.
250-mLErlenmeyer
flask
water
d.
deionized
e.
stirplate
B.
U SE :
1.
Measuring
Alkalinitv
a.
Collectabout200- 500 mL of samplewater,andallowit to warmor cool
to nearroomtemperature.
b.
Rinseall neededglassware
oncewithsamplewater.
c.
anddeliverytube.
Assembledigitaltitrator,titrationcartridge,
d.
Withthe assembled
titratorin an upwardposition,
turnthe deliveryknob
air bubblesin the
to ejecta few dropsof titrant,whichwilleliminate
deliverytube. Resetthe counterto zero.
e.
measureout 100mL of sample
Usingthe 100-mLgraduated
cylinder,
flask.Placea stir
water,thentransferthisto a clean250-mLErlenmeyer
bar intoflask.
f.
lndicatorPowderPillow(PIPP),
Addthe contentsof one Phenolphthalein
setflaskon stirplate,
andswirlthe solutionto mix.
g.
end
lf the solutionturnspinkwhena PIPPis added,titrateto a colorless
point. Do thisby placingthe deliverytubeintothe solution,andslowly
turningthe deliveryknob. Recordthe numberof digitsrequiredandgo to
step8.1.h. lf solutionremainscolorless(i.e.,does not turn pink)
when the PIPPis added,proceedto step B.1.i.
h.
Calculate:
DigitsRequired
x 1 = mg/LCaCO,Alkalinity
i.
Green-Methyl
Red IndicatorPowder
Add the contentsof one Bromcresol
mixon stirplate.Solutionwillturna
Pillowto theflask,allowto thoroughly
greenishbluecolor.
AtxauHrrv
Hach Digital Titrator: Phenolphthaleinand Total Alkalinity
(continued)
j.
placedeliverytubetip intothe solution
Whilestirringsolutionon stirplate,
and begintitratingto changethesolutioncolorfromgreenishblueto a
lightpink(whichwillhappenat aboutpH a.6). At the beginning
of
titration,
advancedigits5 - 10 at a time;towardsthe end,whenthe
solutionfirst beginsto changecolor,advancethe digitsat a slowerrate.
Recordthe numberof digitsrequiredto reachthe lightpinkcolor,thengo
to step8.1.k. (Nofe; Titrateslowly!)
k.
Usethefollowing
formulato calculate
thefinalconcentration:
1.
DigitsRequired
x 1 = mg/Las CaCO.TotalAlkalinity
a.
2.
3.
(158x 1) = 158mg/Las CaCO.TotalAlkalinity
Example:
Note:Potentialinterferences
to measurements
include:
a.
Highlycoloredor turbidsamplesmaymaskthe colorchangeat the end
point.
b.
Excessiveagitationof samplesor prolongedexposureof samplesto air.
Samplesshouldbe analyzedas soonas possibleaftercollectionbut can
be storedat least24 hoursby coolingto 4'C (39"F)or below. Warm
samplesto nearroomtemperature
beforeanalyzing.
Whenfinishedtitrating,takeapartthe digitaltitrator,rinseout all glasswareand
the deliverytube,replacelid on sulfuricacidtitratorcartridge.
Hach Company (1 -800-227-4224;www.hach.com)

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