Lab Tests, results, and Sulphuric acid Tes lab, hasil, dan asam sulfat
Lab acid titrate
Transcript of Lab acid titrate
![Page 1: Lab acid titrate](https://reader036.fdocuments.in/reader036/viewer/2022062303/55610565d8b42a91388b5980/html5/thumbnails/1.jpg)
ENTERENTER
TBC 3013TBC 3013
*********
LECTURER : DR ROSMILA MISNAN LECTURER : DR ROSMILA MISNAN
Acid-base titration report Acid-base titration report
USER NAME :
PASSWORD :
![Page 2: Lab acid titrate](https://reader036.fdocuments.in/reader036/viewer/2022062303/55610565d8b42a91388b5980/html5/thumbnails/2.jpg)
GROUP MEMBERS
NAME MATRIC NO.
UMI ABIBAH BT SULAIMAN D20091034811
SITI RAHAYU BT MOHAMED NOOR D20091034855
NUR AFIQAH BINTI MUHAMAD
APANDI
D20091034872
AMEERA BT YAHYAD20091034814
![Page 3: Lab acid titrate](https://reader036.fdocuments.in/reader036/viewer/2022062303/55610565d8b42a91388b5980/html5/thumbnails/3.jpg)
ABSTRACABSTRACTT
The main objective of this study was to investigate the property of weak acid with pH changes.
Result was collected from the pH meter during the titration of acetic acid and phosphoric acid with 1mL of 0.1M NaOH .
The graph pH against volume of NaOH is plotted and the pKa value was determined. Both acid have different pKa value and horizontal part of the curve.
The study recommends that the larger the value of pKa, the smaller the extent of dissociation while the smaller the pKa value the higher the extent of
dissociation.
![Page 4: Lab acid titrate](https://reader036.fdocuments.in/reader036/viewer/2022062303/55610565d8b42a91388b5980/html5/thumbnails/4.jpg)
INTRODUCTIONINTRODUCTION laboratory method of quantitative
analysis used to determine unknown concentration of known substance.
can determined pKa of an acid from the graph.
value used to describe the tendency of compounds or
ions to dissociate.This allows the proportion of neutral and
charged species at any pH to be calculated, as well as the basic or acidic properties of the compound to be defined.
Titration
Pka value
![Page 5: Lab acid titrate](https://reader036.fdocuments.in/reader036/viewer/2022062303/55610565d8b42a91388b5980/html5/thumbnails/5.jpg)
METHOD:
ACID BASE TITRATION
![Page 6: Lab acid titrate](https://reader036.fdocuments.in/reader036/viewer/2022062303/55610565d8b42a91388b5980/html5/thumbnails/6.jpg)
METHOD : ACID BASE TITRATION
Calibrated pH meterTitration apparatus
![Page 7: Lab acid titrate](https://reader036.fdocuments.in/reader036/viewer/2022062303/55610565d8b42a91388b5980/html5/thumbnails/7.jpg)
Titration in progress
![Page 8: Lab acid titrate](https://reader036.fdocuments.in/reader036/viewer/2022062303/55610565d8b42a91388b5980/html5/thumbnails/8.jpg)
Table : Volume of NaOH used and the pH values recorded
![Page 9: Lab acid titrate](https://reader036.fdocuments.in/reader036/viewer/2022062303/55610565d8b42a91388b5980/html5/thumbnails/9.jpg)
RESULTRESULT
![Page 10: Lab acid titrate](https://reader036.fdocuments.in/reader036/viewer/2022062303/55610565d8b42a91388b5980/html5/thumbnails/10.jpg)
Graf 1: Graf 1: pH pH vs Volume of NaoH vs Volume of NaoH (Acetic Acid) (Acetic Acid)
pKa1=5.52
![Page 11: Lab acid titrate](https://reader036.fdocuments.in/reader036/viewer/2022062303/55610565d8b42a91388b5980/html5/thumbnails/11.jpg)
To calculate the acid dissociation constant (pKa), one must find the volume at the half-equivalence point, that is where half the amount of titrant has been added to form the next compound.
From the graph plotted the pKa for acetic acid is 5.52 compare to the theoretical value which is 4.76.
Halfway between each equivalence point, at 4 mL ,the pH observed was about 5.52 , giving the pKa.
![Page 12: Lab acid titrate](https://reader036.fdocuments.in/reader036/viewer/2022062303/55610565d8b42a91388b5980/html5/thumbnails/12.jpg)
Graf 2: Graf 2: pH pH vs Volume of NaoH vs Volume of NaoH (Phosphoric Acid) (Phosphoric Acid)
pKa1=3.21
pKa2=7.44
pKa3=12.24
![Page 13: Lab acid titrate](https://reader036.fdocuments.in/reader036/viewer/2022062303/55610565d8b42a91388b5980/html5/thumbnails/13.jpg)
Then, the pKa value for phosphorus acid accoding to the graph are 3.21,7.44 and 12.24 compare to the theoretical value which are 2.15,7.20 and 12.35.
Halfway between each equivalence point, at 4 mL , 12.5 mL and 19.5, the pH observed was about 3.21, 7.44 and 12.24 , giving the pKa.
![Page 14: Lab acid titrate](https://reader036.fdocuments.in/reader036/viewer/2022062303/55610565d8b42a91388b5980/html5/thumbnails/14.jpg)
The pKa from the experiment result was not too accurate compare to the theoretical value. This might be happened because of:
pH meter used also not too
suitable and not measured the accurate pH
reading.
Not precisely added 1ml of
0.1M NaOH for every step
titration process.
![Page 15: Lab acid titrate](https://reader036.fdocuments.in/reader036/viewer/2022062303/55610565d8b42a91388b5980/html5/thumbnails/15.jpg)
The pKa of an acid can be determined from the part of the graph having flat or more horizontal part of the curve.
The larger the value of pKa, the smaller the extent of dissociation while the smaller the pKa value the higher the extent of dissociation.
![Page 16: Lab acid titrate](https://reader036.fdocuments.in/reader036/viewer/2022062303/55610565d8b42a91388b5980/html5/thumbnails/16.jpg)
For acetic acid one horizontal part on the curve
For phosphoric acid three horizontal parts
The difference arise
Due to acids having one or more than one dissociation constant in order for all the H+ ions can react completely
with the OH- ions being added during the titration process.
![Page 17: Lab acid titrate](https://reader036.fdocuments.in/reader036/viewer/2022062303/55610565d8b42a91388b5980/html5/thumbnails/17.jpg)
CONCLUSIONCONCLUSION
As a conclusion,
able to identidy the pKa of an acid by using titration.
learn how to use pH meter correctly.
![Page 18: Lab acid titrate](https://reader036.fdocuments.in/reader036/viewer/2022062303/55610565d8b42a91388b5980/html5/thumbnails/18.jpg)
REFERENCEShttps://docs.google.com/viewer?
a=v&q=cache:hWqGYixWkLsJ:www2.chem.ubc.ca/courseware/330/pKa.pdf+&hl=en&gl=my&pid=bl&srcid=ADGEESi0c85vsFbBU4uwyfTNi2oMOBB8prpi05jtfiPOheSrjLORUpXTvhvoLAAALjoQweS1utzrEGWeJkbUGBuwsixCBSHf3ULXuzjHyDGhG4MAQNjL86hdoGlCTWzD0Hc6v12ZMAI0&sig=AHIEtbTBuPkVBPk4IcMmhHj7n0u1hNGnXw
https://docs.google.com/viewer?a=v&q=cache:oOMX3c6_bfoJ:www.deltacollege.edu/emp/ckim/Labs_PDF/AcidBaseTitrationCurveLab.pdf+&hl=en&gl=my&pid=bl&srcid=ADGEESjl3hlEXLOO2UI_DXZGy35s8xAPURLrBVvoCgc7WH8O1lWP4yTZuSvdNhoEgwdMKoVoXJsSIFhktON_PWOttJPKukddWLfQGe7UChJESb0bPka_sPmk81gIvaAQE8o7lrIa1CAl&sig=AHIEtbRprjL5NExSdDjM_UtF5F-LJ4hdvQ
![Page 19: Lab acid titrate](https://reader036.fdocuments.in/reader036/viewer/2022062303/55610565d8b42a91388b5980/html5/thumbnails/19.jpg)
THANK YOU!!!!