Chlorophenol red explained

Chlorophenol red is an indicator dye that changes color from yellow to violet in the pH range 5.4 to 6.8.[1] The pH of a substance is determined by taking the negative logarithm of the Hydronium ion concentration and the indictor changes color due to the dissociation of H+ ions.[2] The lambda max is at 572 nm.[3]

Properties and uses

The dissociation mechanism of chlorophenol red is similar to that of phenolphthalein meaning it can be used as a color indicator. The dissociation of hydroxyl and hydrogen atoms creates the dissociate scheme of chlorophenol red to change color from yellow to red.[4] The pH properties of chlorophenol red are used to selectively determine the amount of chlorine dioxide in drinking water. Chlorophenol red selectively reacts with 0.1–1.9 mg/L chlorine dioxide at pH 7.[5] The electrochemical properties of Chlorophenol red allows it to be a chromogenic label and can undergo oxidation creating several phenolic intermediates. The bacterial hydrolysis of a chlorophenol red labelled substrate produces chlorine retaining intermediates on electrodes.[6]

Cited sources

Notes and References

  1. Haynes, p. 8.88
  2. Web site: 2013-10-02. pH Indicators. 2021-03-14. Chemistry LibreTexts. en.
  3. Web site: Chlorophenol Red .
  4. Hanai. Toshihiko. 2016. Quantitative Evaluation of Dissociation Mechanisms in Phenolphthalein and the Related Compounds.. Journal of Computer Chemistry. 15. 13–21. 10.2477/jccj.2015-0055 . free.
  5. Sweetin. Deborah L.. Sullivan. Elizabeth. Gordon. Gilbert. 1996-01-01. The use of chlorophenol red for the selective determination of chlorine dioxide in drinking water. Talanta. 43. 1. 103–108. 10.1016/0039-9140(95)01721-6. 18966469.
  6. Casimero. Charnete. Bigham. Teri. McGlynn. Ruairi J.. Dooley. James S. G.. Ternan. Nigel G.. Snelling. William J.. Critchley. Megan E.. Zinkel. Cameron L.. Smith. Robert B.. Sabogal-Paz. Lyda P.. Davis. James. 2019-12-01. Electroanalytical properties of chlorophenol red at disposable carbon electrodes: Implications for Escherichia coli detection. Bioelectrochemistry. 130. 107321. 10.1016/j.bioelechem.2019.06.006. 31306878. 196813601 .

This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Chlorophenol red".

Except where otherwise indicated, Everything.Explained.Today is © Copyright 2009-2024, A B Cryer, All Rights Reserved. Cookie policy.