Using graphics of logarithmic concentration (GLC) in the titration of bases and mixture of bases

The general programme, which is to draw the Graphics of Logarithmic Concentration (GLC) forming the total line, constructed quickly and to exactly determine the pH at the equivalence point and the titration jump in the titration of bases and mixture of bases with strong acid. | JOURNAL OF SCIENCE OF HNUE Natural Sci. 2011 Vol. 56 No. 7 pp. 87-99 USING GRAPHICS OF LOGARITHMIC CONCENTRATION GLC IN THE TITRATION OF BASES AND MIXTURE OF BASES Dao Thi Phuong Diep Nguyen Thi Thanh Mai Phan Thi Thuy Linh and Luu Thi Luong Yen Hanoi National University of Education E-mail diepdp@ Abstract. The general programme which is to draw the Graphics of Log- arithmic Concentration GLC forming the total line constructed quickly and to exactly determine the pH at the equivalence point and the titration jump in the titration of bases and mixture of bases with strong acid. The study results using GLC without difficulty in combining and solving the equations of higher degrees which are in fine agreement with those by the general methods. Keywords Graphics of Logarithmic Concentration titration of bases and mixture of base pH titration jump. 1. Introduction In the acid-based titration it is important to have a suitable indicator which experiences a change in colour end point as close as possible to the equivalence point EP of the reaction. Due to the appearance of the titration jump on the titration curve we can choose any acid-based indicator which has the pT value ranging within the titration jump with an allowable error 1 2 . The Graphics of Logarithmic Concentration method 3 4 has been used to evaluate exactly the pH of the acid-based solutions 5 6 to determine the pH at the equivalence point pHEP and the titration jump in the titration of acids with strong bases 7 . In this paper we study the applications of GLC the general programme has been written with the PASCAL language to draw it with forming the total line constructed in the titration of bases and mixture of bases. 2. Content The way to construct GLC and the steps in determining pH equilibria com- ponents in solution using GLC are done similarly to the reference 5 . To estimate the pHEP value and titration jump we study some cases titra- tion of monoprotic bases with a mixture of strong and

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