Titration level 1 labnotebook PDF

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Royal Society of chemistry titration level 1...

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Titrationlevel1 EsmeraldaMaldonado Aims Inlevel1,you'llanalysesamplesfromariverthathasbeencontaminatedwithacid.You'llperformtitration experimentstoworkouttheconcentrationofacidinthesamples.

Ineachactivityyou'llbeabletocollectpoints.Attheendofthelevelyoucanrestarttoimproveyourskills.

Video100Points

Comprehension100Points1Attempt Hydrochloricacidfullydissociateswhendissolvedinwater. ThepHofwaterisapproximately7whichmeansitisneutral. Whenanacidandalkalireacttoformwaterandsaltitiscalledneutralisation. Atitrationexperimentcanbeusedtodeterminetheunknownconcentrationofacidusingaknownconcentrationof base. Anindicatorhelpsustoseethepointofneutralisationduringatitrationexperimentbycausingacolourchange.

Acidsandalkalis100Points pH0-2

pH7

pH12-14

hydrochloricacid

distilledwater

sodiumhydroxide

sulfuricacid

potassiumhydroxide

nitricacid

calciumhydroxide

Phenolphthaleinisanindicatorwhichchangescolourclosetothepointofneutralisationandisusedtoshowtheendpointofthistitration.Whenaddingastrongacidtoastrongbasethephenolphthaleinindicatorchangescolourfrom pinktocolourless.

MeasuringMass100Points1Attempt Youcorrectlyusedthebalancetoaccuratelyweigh: Massofsodiumhydroxide=1.00g Thiswastransferredtoabeakerforyoureadyforthenextstepoftheexperiment.

Standardsolution100Points Firstthesodiumhydroxidepowderwasdissolvedindistilledwater. Nextyoutransferredtosolutiontoa250.0cm3volumetricflaskandrinsedthebeakerwithmorewater. Finallyyoumadeupthestandardsolutiontothetothe250.0cm3levelusingadroppingpipette

Alkaliconcentration100Points Youcalculatedthemolarmassforsodiumhydroxideas40gmol-1. Thenyouworkedouttheamountofsodiumhydroxideyouusedwas0.0250mol. Finallyyoucalculatedtheconcentrationofyourstocksolutionasbeing0.10moldm-3.

Preparingfortitration100Points1Attempt Firstyourinsedapipettewithyoursodiumhydroxidesolution. Nextyouusedthepipettetotransferexactly25.003ofthesolutionintoaconicalflaskandadded3dropsof phenolphthaleinindicator.

Burettesetup100Points1Attempt Firstyourinsedaburettewithdistilledwater. Nextyourinsedtheburettewithyouracidiccontaminatedriversample. Thenyoufilledtheburettewiththeriversampleandensuredtheeyelevelwasgoodforreadingtheburettelevel Thenyouremovedthefunnel. Finallytheburettewasfilledbelowthetapbyrunningoutsomesolution.

Titrationexperiment80Points YouperformedtitrationexperimentsoncontaminatedriverwaterfromtwositesBandC. Samplesite B

Trial

1st accurate titration

2nd accurate titration

Finalreading (cm3)

26.80

26.25

25.85

Initialreading (cm3)

9.55

9.60

9.20

Volumeadded (cm3)

17.25

16.65

16.65

Average volumeadded (cm3)

16.65

Samplesite C

Trial

1st accurate titration

2nd accurate titration

Finalreading (cm3)

40.15

42.30

41.65

Initialreading (cm3)

9.20

11.30

10.65

Volumeadded (cm3)

30.95

31.00

31.00

Average volumeadded (cm3)

31.00

Numberoftimes thatsampleB wastested

1

Averagevolume addedforall samples(cm3)

16.65

Numberoftimes thatsampleC wastested

1

Averagevolume addedforall samples(cm3)

31.00

Titrationanalysis Youhavenotcompletedthissectionyet.

Review Youhavenotcompletedthissectionyet....