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Universal indicator

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	Topics Universal indicator Topic Home Universal indicator is a pH indicatorPH indicator A pH indicator is a halochromic chemical compound that is added in small amounts to a solution so that the pH of the solutio... 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 YamadaYamada Yamada is the 13th most common Japanese surname.... in 1923. 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. Details pH value: Approximately 7 Vapour pressure: 25 mmHg (3.3 kPa) Vapour densityDensity Density is a measure of mass per unit of volume.... : 1.3 kg/m³ Molecular formula: Mixture A universal indicator is typically composed of water, methanol, propan-1-ol, phenolphthaleinPhenolphthalein Overview Phenolphthalein is a sensitive pH indicator with the formula C20H14O4.... sodium salt, methyl redMethyl red Methyl Red, also called C.I. Acid Red 2, is an indicator dye that turns red in acidic solutions.... sodium salt, bromothymol blueBromothymol blue Bromothymol blue is a chemical indicator for weak acids and bases.... monosodium salt, and thymol blueThymol blue Thymol blue is a brownish-green or reddish-brown crystaline powder that is used as an pH indicator.... monosodium salt 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 See also Litmus paper