FOUNDATIONI NS CIENCES( FIS-YTP)
PRACTICALR EPORTC OVERSHEET
COURSEN AME CHEMISTRY1
COURSEC ODE SCI1 054
LECTURER YUZAILABINTIMUHAMADY UNUS
SESSION/ 2021/22S EMESTER1
SEMESTER
ASSESSMENTD ETAILS
TITLE
DETERMINATIONOFTHEFORMULAU NITO FA C OMPOUND.
COURSE CLO3:Applysometechniquesusedinc hemistrye xperiments.
LEARNING
OUTCOME
Performthefollowingtasks:
INSTRUCTIONS 1.S ubmitthereportingroupasinstructedb yC ourseLecturer.
2.Theg roupc onsistsof3 -4p ersons.
3.R eportmustb einE nglishlanguage.
StudentN ame: Class:
1. NURULA DRIANAB INTIA NUAR FA1
2. ANISNAZIRAHB INTIA ZMI FA3
3. ALIAS UFINAB INTIMOHDS ABRI FA1
Assessor’sC omment: Marks:
CLO MARKINGS CHEME MARKS
TASKN O 3
1 ONLINEP racticalA ssessment 70%
● TeamworkS kills
3 ✔ Cooperative(workingwitho thers) /50
2 ✔ Participation /20
✔ Contributions
✔ Attitude(demonstratesgoodm anners)
✔ ProblemS olving(responsibleforthe
group'sd ecision)
● CriticalT hinkingS kills( CS)
✔ EvaluatesA SSUMPTIONS(T heability
tofindideasandalternative
solutions)(10)
✔ EvaluatesIMPLICATIONS(Theability
tod evelopa ndimprovethinkings kills
suchastoexplain,analyseand
evaluatec onclusionsandd iscussions).
(10)
TechnicalR eport 30%
● Title& o bjectives /3
● Procedure /4
● Data/result /5
● Calculation /5
● Discussion /10
● Conclusion&R eferences /3
Total / 1 00
OBJECTIVE
1) Tos ynthesizeazincchloridecompound.
2) Todeterminetheformulau nitofz incc hloride.
INTRODUCTION
Oneofa compound'smostimportantq ualitiesisitsc hemicalcomposition,whichm aybe
determinedsimplyb yc ountingthec omponentsp resent.D espitetheimportanceo f
qualitativeinvestigation,chemistsmusta lsounderstandthequantitativea spectsofthe
chemical.A quantitativeanalysisc anbed onetofigureo utw hata c ompound'sc omposition
is.Theformulau nitcanbed eterminedoncethecompound'scompositionisunderstood.A
compoundh aving0 .1m oleo fsilverand0.1moleofbromine,forexample,h astheformula
AgBr.A simplechemicalmadeo fzincandc hlorinewillbec reatedinthise xperiment.O nce
themasso fz incandthem assofthecompoundareknown,themasso fchlorinec anbe
determined.Usingthesemasses,thepercentagecompositionofthec ompoundcanbe
calculatedandtheformulau nitc anbedetermined
PROCEDURE
Listofa pparatus Hotp late,c rucible,whitetile,glassrod,
crucible,tongs,1 0mlmeasuringc ylinder,
analyticalb alance,spatula.
6M H ydrochloricacid,H Cl,Zincp owder
Listofmaterials
Procedure 1. Setu palla pparatusasa bove.
2. Thec rucibleisweighedbyu sing
analyticalb alanceandthee xact
massisrecorded.
3. Then,thetareb uttonisp ressed.
4. 0.25gZincpowderisp laced
approximatelyintothec rucibleb y
usinga spatula.
5. Thee xactm assisrecorded.
6. Thec ruciblew ithZ incpowderis
RESULTS weighedbyu singa nalyticalb alance
andthereadingisrecorded.
7. 10mlof6MHydrochloricacid,HCl
isaddedcarefullyintothecrucible.
8. Zincp owderiss tirredgentlyuntila ll
ofthema red issolvedbyusinga
glassrod.
9. Thec ompoundish eatedgentlyuntil
itiscompletelyd ry.
10. Thec rucibleisremovedfromthe
hotp lateimmediately.
11. Then,thecrucibleiscoveredandit
isallowedtoc ooltoroom
temperature.
12. Thecruciblea ndthec ompoundis
weighedagaino ntheanalytical
balanceandthemassisrecorded.
13. Thec rucibleisreheatedtodrythe
compound.
14. Thep rocedureisrepeateduntilthe
differenceinm assdoesn ote xceed
0.02g.
15. Precautionarys teps:Step8mustbe
carriedo utina fumecupboard.D o
notworkn earthefiresource.Wet
Hydrogengascancausee xplosions.
56.299g
Masso fc rucible
Massofc ruciblea ndz incpowder 56.549g
Massofzincp owder 0.25g
MassofC rucibleandZincC hloride
Massafterfirsth eating 56.835g
Massafters econdh eating 56.829g
AVERAGEMASS
Massofz incc hloride 0.53g
Massofc hlorine 0.28g
DISCUSSION
Toincreasetheaccuracyo ftheexperiment,theprocesso fz incc hlorideh eatingneedstobe
donethreetimes.However,thep rocessofzincchlorideinthise xperimentwascarriedo ut
twotimesastheexperimentwasc arriedoutvirtually.Thesafetyprecautionsd uringthe
experimenta rethatafireextinguisherwask epthandyasu singfirewasthep artofthe
experiment.Ifthefirebreaksoutduringthee xperiment,thefirecanb estopped
immediately.H ence,wearingg lovesc oulda voidh andsfromtheexposureofacid.6 M of
hydrochlorica cidh asahighmolarityasaresult,thecontactbetweenacida ndskincan
causeirritation.
Duringu singthemeasuringcylinder,a liquidinasmall-diameterc ontainerwillforma
meniscusorcurveatthesurfaceo ftheliquid.U sually,thism eniscusc urvesd ownwardtoa
minimumatthec enter.Toreadthelevelo ftheliquidp roperly,theeyes houldbea tthe
samelevelasthebottomo fthemeniscus.Nextd uringusingtheanalyticalb alance,itis
importanttoS electa s uitablecontainertoweighthec hemicalina ndz erothebalanceb y
pressingtheTAREb uttono rb arw hichislocatedatthefronto ftheb alancetoa llowthe
balancereadingtostabilize.
CONCLUSION
1) ZincChloridecompoundiss ynthesised.
2) Theformulaunito fZincChlorideisZnCl2.
REFERENCES
PrecautionstoT akeWhenD oingS cienceExperiments.(2011,March21).P recautionstoT ake
WhenDoingS cienceExperiments.Retrievedfrom
https://www.bachelorsofscience.org/precautions-to-take-when-doing-science-experiments
Jackson,P.(2018,M arch1 3).H ydrochloricA cid S afetyPrecautions.R etrivedfrom
https://sciencing.com/hydrochloric-acid-safety-precautions-8113822.html
UKEssays.(2017,N ovember17).C hemicalFormulaofZ incO xide.R etrievedfrom
https://www.ukessays.com/essays/chemistry/chemical-formula-zinc-oxide-5177.php?vref=1
QUESTIONS
1. Explainw hythecontentisn otw eighedw hileitish ot.
The content is n ot weighed w hile it is h ot because the hot object will radiate heat in
the form o f convection currents in the a ir above the s cale. This w ill a lter the a ir
pressure a bove the o bject u npredictably a nd p roduce u nstable readings o f the o bject
thatisb eingmassed.
2. Calculatetheformulaunito fz incc hloride.
Element Zn Cl
Mass(g) 0.25 0.28
NumberofMole 0.25/65 0.28/35
=0 .0038 =0.0083
Ratio 0.0038/0.0038 0.0083/0.0038
=1 =2
FormulaUnito fZincC hloride:ZnCl2
3. Writetheb alancedchemicalequationforthereaction.
→Zn(s)+ 2HCl(l) ZnCl2+H2(g)
4. Comparethecalculatedformulau nitwiththetheoreticalformulau nito fZinc
Chloride.
Boththecalculatedformulaunitandthetheoreticalformulau nito fzincC hloride
havethesameformulaunitwhichisZ nCl2.
5. Suggestthepossiblereasonsforthedifferenceine xperimentalformulau nita ndthe
theoreticalformulau nit.
Possiblereasonsforthedifferencebetweenthee xperimentalformulaunitandthe
theoreticalformulau nitisbecausethee xperimentwasd oneinano penp lacew here
airispresent.Apartfromthat,whenthew eighingp rocessisdoneinano pen
conditionw hichisnotclosedwitha cover,itc anc auses omee rrorstoo.Inorderto
overcomethiserror,theweightbalances houlda lwaysh aveitsc overtop reventthe
airweight.