Universal indicator


Universal indicator

Universal indicator is a pH indicator that transitions through numbers 3-12 (on the pH chart) to indicate the acidity or alkalinity of solutions. Although there are a number of commercially available universal pH indicators, most are a variation of a formula patented by Yamada in 1923. ["Jap. Pat." 99,664, Feb 21, 1933] Details of this patent can be found in "Chemical Abstracts". ["Chem Abstr", 28, 2258 (1934)]

Experiments with Yamada's Universal Indicator are also described in the Journal of Chemical Education. [For a discussion of these experiments, as well as recipes for Yamada and other universal indicators, see Foster, S.F. and Gruntfest, "J.Chem.Educ.", 14, 274(1937)]

Details

*pH value: Approximately 7
*Vapour pressure: 25 mmHg (3.3 kPa)
*Vapour density: 1.3 kg/m³
*Molecular formula: Mixture
*Original colour: colourless

A universal indicator is typically composed of water, methanol, propan-1-ol, phenolphthalein sodium salt, methyl red sodium salt, bromothymol blue monosodium salt, and thymol blue monosodium salt [" [http://www.iscid.org/encyclopedia/Universal_Indicator Universal Indicator] ". ISCID Encyclopedia of Science and Philosophy.]

Here are the colours that indicate the acidity of a solution, after adding UI:

1. Very acidic - Red

2. Acidic - Orange/Yellow

3. Neutral - Green

4. Basic/base/alkali - Blue

5. Very basic/base/alkali - Purple

ee also

*Litmus paper

References


Wikimedia Foundation. 2010.

Look at other dictionaries:

  • Universal Indicator — est le nom de groupe d artistes, membres de Rephlex Records, et ayant sorti un certain nombre de LP d Acid House (d où la référence du nom au son acide comme Indicateur de pH). Le collectif a été inspiré par des producteurs anglais tels que Baby… …   Wikipédia en Français

  • universal indicator — noun A mixture of chemical indicators that gives a definite colour change for each integral change in pH value over a wide range • • • Main Entry: ↑universe * * * universal indicator UK US noun [countable] [singular universal indicator …   Useful english dictionary

  • universal indicator — UK / US noun [countable] Word forms universal indicator : singular universal indicator plural universal indicators chemistry a chemical solution that changes to different colours depending on how acid or alkaline the substance being tested is …   English dictionary

  • universal indicator — universalusis indikatorius statusas T sritis Standartizacija ir metrologija apibrėžtis Indikatorių mišinys, kurio spalvų gama keičiasi visame pH intervale (nuo 1 iki 14). atitikmenys: angl. universal indicator rus. универсальный индикатор, m… …   Penkiakalbis aiškinamasis metrologijos terminų žodynas

  • universal indicator — universalusis indikatorius statusas T sritis chemija apibrėžtis Indikatorių mišinys, kurio spalvų gama keičiasi visame pH intervale (1–14). atitikmenys: angl. universal indicator rus. универсальный индикатор …   Chemijos terminų aiškinamasis žodynas

  • universal indicator — noun Chemistry a mixture of dyes that changes colour gradually over a range of pH and is used to test for acids and alkalis …   English new terms dictionary

  • Universal Indicator Blue — est un album du groupe Universal Indicator sorti en 1992. Sommaire 1 Commentaire de Mike Dred 2 Liste des morceaux 3 Notes 4 Fiche …   Wikipédia en Français

  • Universal indicator ultra-violet — The Kosmik Kommando Universal Indicator 5 Ultra Violet Liste des morceaux A1 Untitled A2 Untitled A3 Untitled B1 Untitled B2 Untitled B3 Untitled Notes Emballés dans une pochette spéciale ultra violette sensible à la lumière UV et qui décode un… …   Wikipédia en Français

  • Universal Indicator 5 (Ultra-Violet) — Infobox Album Name = Universal Indicator 5 (Ultra Violet) Type = studio Artist = Kosmik Kommando Released = 2001 Recorded = 1990 ndash;1992 Genre = Length = Label = Beta Bodega BB03.5 Producer = Reviews = Last album = This album = Next album =… …   Wikipedia

  • Universal Indicator (music) — Infobox Musical artist Name = Universal Indicator Img capt = Img size = Landscape = Background = group or band Alias = Origin = Instrument = Genre = Occupation = Years active = 1992 1995, 2001 Label = Rephlex Records Associated acts = Mike Dred… …   Wikipedia


Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”

We are using cookies for the best presentation of our site. Continuing to use this site, you agree with this.