what colour would universal indicator show in an aqueous solution of sugar why
Universal indicator - wikipedia Universal indicator Jump to : navigation , search This article is about the chemical pH indicator . For the musical artists , see Universal Indicator ( collective ) . A roll of universal indicator paper Colours of universal indicator A universal indicator is a pH indicator composed of a solution of several compounds that exhibits several smooth colour changes over a pH value range from 0 to 14 to indicate the acidity or alkalinity of solutions , where 7 indicates neutral . Although there are several commercially available universal pH indicators , most are a variation of a formula patented by Yamada in 1933 . Details of this patent can be found in Chemical Abstracts . Experiments with Yamada 's universal indicator are also described in the Journal of Chemical Education . A universal indicator is typically composed of water , propan - 1 - ol , phenolphthalein sodium salt , sodium hydroxide , methyl red , bromothymol blue monosodium salt , and thymol blue monosodium salt . The colours that indicate the pH of a solution , after adding a universal indicator , are : pH range Description Colour Strong acid Red 3 -- 6 Weak acid Orange or yellow 7 Neutral Green 8 -- 11 Weak base Blue > 11 Strong base Violet or Indigo The colours from yellow to red indicate an acidic solution , colours blue to violet indicate bases and green colour indicates that a solution is neutral . Universal indicator components Indicator Low pH colour Transition pH range High pH colour Thymol blue ( first transition ) Red 1.2 -- 2.8 Yellow Methyl red Red 4.4 -- 6.2 Yellow Bromothymol blue Yellow 6.0 -- 7.6 Blue Thymol blue ( second transition ) Yellow 8.0 -- 9.6 Blue Phenolphthalein Colourless 08.3 -- 10.0 Fuchsia Wide - range pH test papers with distinct colours for each pH from 1 to 14 are also available . Colour matching charts are supplied with the specific test strips purchased . Types of universal indicator ( edit ) Colour Change of Universal Indicator after immersing into Basic NaOH solution . Universal Indicator Test Kit Colour Change of Universal Indicator after immersing into a Neutral solution A universal indicator is collectively a mixture of indicators which show a colour change in a solution , which interprets how acidic or basic a solution is . A universal indicator can be in paper form or present in a form of a solution . Paper form : Is a strip of coloured paper which changes colour to red if the solution is acidic and to blue if the solution is basic . The strip can be placed directly onto a surface of a wet substance or few drops of the solution can be dropped onto the universal indicator using dropping equipment . If the test solution is of a dark colour , it is preferable to use a paper universal indicator . Solution : The main components of a Universal indicator , in the form of a solution , are thymol blue , methyl red , bromothymol blue , and phenolphthalein . This mixture is important because each component loses or gains protons depending upon the acidity or basicity of the solution being tested . It is beneficial to use this type of a universal indicator in a colourless solution . This will increase the accuracy of indication . See also ( edit ) Litmus pH indicator References ( edit ) Jump up ^ Jap . Pat . 99,664 , Feb 21 , 1933 Jump up ^ Chem Abstr , 28 , 2258 ( 1934 ) Jump up ^ For a discussion of these experiments , as well as recipes for Yamada 's and other universal indicators , see Foster , L.S. ; Gruntfest , I.J. ( 1937 ) . `` Demonstration experiments using universal indicators '' . Journal of Chemical Education . 14 ( 6 ) : 274 . Bibcode : 1937JChEd ... 14 ... 274F . doi : 10.1021 / ed014p274 . Jump up ^ `` Universal Indicator Archived September 25 , 2006 , at the Wayback Machine . '' . ISCID Encyclopedia of Science and Philosophy . Jump up ^ Walker , Denise ( 2007 ) . Acids and alkalis ( 1 ed . ) . London : Evans . p. 13 . ISBN 0 - 237 - 53002 - 3 . Retrieved 4 June 2015 . Retrieved from `` https://en.wikipedia.org/w/index.php?title=Universal_indicator&oldid=805053664 '' Categories : PH indicators Hidden categories : Webarchive template wayback links Talk About Wikipedia Čeština Deutsch Eesti Ελληνικά Français Bahasa Indonesia Italiano 日本 語 Polski Português Simple English Svenska తెలుగు 中文 Edit links This page was last edited on 12 October 2017 , at 19 : 26 . About Wikipedia
1. pH indicator
2. Acidity and alkalinity
3. Universal indicator paper
4. Colour changes
5. pH range