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Re-blue-ing Blue Litmus Paper

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Margaret J. Steffel

The Ohio State University Marion Campus, Chemistry Dept., 1465 Mt. Vernon Ave., Marion, OH 43302-5695

J. Chem. Educ., 1998, 75 (2), p 183

DOI: 10.1021/ed075p183.1

Publication Date (Web): February 1, 1998

Section:

History, Education, and Documentation

Abstract

This demonstration illustrates that acid-base indicators may come in many forms, and further exhibits the reversible effects that acids and bases may have on the colors of such indicators. It is described here in the form in which it was presented during Michigan State University's Chemusical Extravaganza at the ChemEd '93 Conference at Butler University, Indiana. Several variations that are employed by the MSU Science Theatre demonstration group are also discussed.

The demonstration involves the dyeing of an object in an indicator, which causes the object to turn dark blue at pH less than 3.0 to 5.0.

Keywords (Audience):

High School / Introductory Chemistry

Keywords (Subject):

Acids / Bases

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This article has been cited by 1 ACS Journal articles (1 most recent appear below).

C-SNARF-1 as a Fluorescent Probe for pH Measurements in Living Cells: Two-Wavelength-Ratio Method versus Whole-Spectral-Resolution Method
A-C. Ribou , J. Vigo and J-M. Salmon
Journal of Chemical Education2002 79 (12), 1471
- C-SNARF-1 as a Fluorescent Probe for pH Measurements in Living Cells: Two-Wavelength-Ratio Method versus Whole-Spectral-Resolution Method
  A-C. Ribou , J. Vigo and J-M. Salmon
  Journal of Chemical Education2002 79 (12), 1471
  Measuring intracellular concentrations of ions (H+, Ca2+, Mg2+) is one of the challenges of modern cell biology. Fluorescence techniques can be used for this purpose since they are noninvasive, specific, and in general sensitive enough to require only low ...
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