Balkancı, Arda (2009) WHICH METHOD IS THE BEST FOR DETERMINING THE END-POINT IN STRONG ACID – STRONG BASE TITRATIONS: USING A PH INDICATOR, MEASURING TEMPERATURE CHANGE, OR MEASURING RESISTANCE? Other thesis, TED ANKARA COLLEGE FOUNDATION HIGH SCHOOL.
![[img]](http://tedprints.tedankara.k12.tr/style/images/fileicons/text.png)
|
Text
2009-ARDA_BALKANCI.pdf Available under License Creative Commons Attribution Non-commercial. Download (1MB) |
Abstract
In this essay, three of the methods for finding the end-point in acid-base titrations are examined and compared. The titration is done with 0.1 molar NaOH as the titrant and 0.1 molar HCl as the analyte. The methods are: Using phenolphthalein as an indicator, measuring the temperature change, measuring the resistance of the analyte. The goal is to determine which method among these three is the most accurate, in order to find out which method can be used in the absence of a pH meter In each method, a pH meter is also used to see the actual pH when the method comes to the end-point. The variables for each experiment are graphed, together with pH, and then at the end-point of the methods the pH is found using graphing software. The mean values for each method are calculated and compared with the literature value of the equivalence point for this titration, which is 7. The indicator method is proved to be the best among these three with a very low error percentage, the resistance method comes second, however it has a high error percentage and is not very appropriate for using in this titration. The temperature method did not give any sign of reaching the end-point; therefore its error percentage could not be calculated and proved that it is not suitable for this titration. For titrations with different conditions all the methods have to be tested again before deciding which is the best. To sum up, amongst these methods, using phenolphthalein as an indicator of the endpoint is the best method to use in the absence of a pH meter, for this acid-base titration.
| Item Type: | Thesis (Other) |
|---|---|
| Additional Information: | Supervisor’s Name: Sedef Eryurt, IB Notu: B |
| Uncontrolled Keywords: | acid-base titrations, titration, acid, solutions |
| Subjects: | Q Science > QD Chemistry |
| Depositing User: | Kamil Çömlekçi |
| Date Deposited: | 28 May 2009 06:42 |
| Last Modified: | 15 Apr 2019 10:48 |
| URI: | http://tedprints.tedankara.k12.tr/id/eprint/3 |
Actions (login required)
 |
View Item |
