Farklı indikatör karışımlarının pH dönüm aralıklarının incelenmesi

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Budak T.

4th International Academic Studies Conference, 28-30 September 2020, Elazığ, Turkey, 28 September - 30 December 2020, vol.1, pp.326-329

  • Publication Type: Conference Paper / Full Text
  • Volume: 1
  • City: Elazığ
  • Country: Turkey
  • Page Numbers: pp.326-329


Determination of the amount of acid and base in the environment is an analysis process that is

frequently required in analytical chemistry and industrial field. By using the titration method, results

can be obtained quickly and at low cost. In this method, choosing the appropriate indicator is an

important factor that can affect the accuracy of the result. Normally, each indicator has a pH

conversion range in which the color change occurs. Below and above this value solution has become

different colors. By using double or triple indicator mixtures, this color turning range is narrowed. In

this study, pH conversion ranges and transformation colors of different indicator mixtures were

investigated using hydrochloric acid and sodium hydroxide solutions. Newly developed bromphenol

blue / dimethyl yellow (pH = 3.4 - 3.75; orange → blue) indicator after titration using methylene blue

/ dimethyl yellow (pH 3.23 - 3.65; violet blue → dark blue) indicator mixture in the literature Trials

with the mixture were repeated. Then the results were evaluated by changing the mixing ratios. When

the obtained results were examined, it was seen that a more precise measurement could be made by

obtaining a narrower turning range than in the literature for this pH range when using a mixture with

a bromphenol blue / dimethyl yellow (h / h) ratio of 4.5 / 0.5.