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What are the indicators that are used in chemistry?

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2011-06-04 14:20:42
2011-06-04 14:20:42

In chemistry, an indicator can refer to one of a few things:

  • pH indicator, a chemical detector for protons in acid-base titrations
  • Redox indicator, a chemical detector for redox titrations
  • Complexometric indicator, a chemical detector for metal ions in complexometric titrations
  • Zeta potential, a property of interfaces in fluids for Zeta potential titration

The most common usage is generally as a pH indicator. Synthetic indicators include:

  • Gentian violet (Methyl violet) - Turns yellow to blue-violet
  • Leucomalachite green (first transition) - Turns yellow to green
  • Leucomalachite green (second transition) - Turns green to colorless
  • Thymol blue (first transition) - Turns red to yellow
  • Thymol blue (second transition) - Turns yellow to blue
  • Methyl yellow - Turns red to yellow
  • Bromophenol blue - Turns yellow to purple
  • Congo red - Turns blue-violet to red
  • Methyl orange - Turns red to orange
  • Bromocresol green - Turns yellow to blue-green
  • Methyl red - Turns red to yellow
  • Methyl red / Bromocresol green - Turns red to green
  • Azolitmin - Turns red to blue
  • Bromocresol purple - Turns yellow to purple
  • Bromothymol blue - Turns yellow to blue
  • Phenol red - Turns yellow to red
  • Neutral red - Turns red to yellow
  • Cresol Red - Turns yellow to reddish-purple
  • Phenolphthalein - Turns colorless to fuchsia
  • Thymolphthalein - Turns colorless to blue
  • Alizarine Yellow R - Turns yellow to red

Many plants or plant parts contain chemicals from the naturally-colored anthocyanin family of compounds. This would include litmus paper, which is a water-soluble mixture of different dyes extracted from lichens, especially Roccella tinctoria. They are red in acidic solutions and blue in basic. Extracting anthocyanins from red cabbage leaves or the skin of a lemon to form a crude acid-base indicator is a popular introductory chemistry demonstration.

Anthocyanins can be extracted from a multitude of colored plants or plant parts, including from leaves (red cabbage); flowers (geranium, poppy, or rose petals); berries (blueberries, blackcurrant); and stems (rhubarb).

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there are 3 types of indicators:- 1. self indicators 2. absorbing indicators 3. external indicators

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The indicators which change color is litmus paper strips.

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Litmus paper, Turmeric paper Methyl orange, Phenolphtalein,

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There are many different indicators in chemistry which can be blue. Some indicators indicate the presence of a species such as a metal ion, whereas others are pH sensitive. The exact meaning depends on the specific indicator used. For example, blue litmus paper indicates a basic solution.

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tamarind,litmus paper,methyle orange

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Some indicators are: methyl orange, thymol blue, Congo red, bromcresol green, phenolphthalein, alizarine yellow R.

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pH indicators are frequently used in analytic chemistry and biology experiments to determine the extent of a chemical reaction. Because of the determination of color, pH indicators are sometimes wrong. For applications requiring precise measurement of pH, a pH meter is frequently used.

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litmus paper and pH scale i am not sure about the rest :)

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potassium permanganate is a good example of self indicator

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Indicators are used frequently for testing pH; but many other indicators exist for other compounds or ions.

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the common indicators are universal indicator and litmus paper

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Forex indicators are tools used to try and evaluate the market predictions. http://www.forexindicators.net/

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Internal indicators that are used in titration exist in the titration reaction as either a reactant or a product. External indicators is added to the reaction mixture, but does not exist in the reaction.

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There is multiple, the most common would probably be Litmus Paper and Universal Indicator. The properties they have (the relavent ones) is that they turn a certain color when mixed with an acid or base.

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Forex indicators are used to detect patterns in the foreign exchange market. In order to correctly identify patterns, Forex indicators look for changes in economic and industry conditions. http://www.forexmarketexplained.com/Top_Five_Economic_Indicators_that_Drive_Forex_Trading.html

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Dalton's symbols are not used in chemistry because it is very difficult to represent in chemistry

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Indicators used outside the titration flask are termed as external indicators. A very commonly used external indicator is potassium ferricyanide

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because external indicators are weak acids or bases and alcohol itself being a weak acid will react with it if it is used in vessel with them..... hence the titration is done using external indicators....

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Indicators are chemicals that change color in the presence of an acid or a base. The most commonly used indicator is phenophthalein.

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I am currently studying Chemistry, and it mainly involves topics such as:AcidsAlkalisChemical ReactionsUniversal IndicatorsOxygen Reactions and other gasesSaltsand generally different chemical mixes etc.

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Indicators are chemical solutions that are used for the main purpose of showing whether the tested solution is an acid or base. That being said indicators can be acids or bases.

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No, it is not. Chemistry is a noun, a science. It is used as a noun adjunct in the terms chemistry class and chemistry book.

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describe what chemists study and how chemistry is used

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Metals are used in chemistry for coating of some metalloids and nonmetals

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There are two types of indicators: * Internal Indicators and * External Indicators


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