In chemistry, an indicator can refer to one of a few things:
The most common usage is generally as a pH indicator. Synthetic indicators include:
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).
there are 3 types of indicators:- 1. self indicators 2. absorbing indicators 3. external indicators
The indicators which change color is litmus paper strips.
Litmus paper, Turmeric paper Methyl orange, Phenolphtalein,
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.
tamarind,litmus paper,methyle orange
Some indicators are: methyl orange, thymol blue, Congo red, bromcresol green, phenolphthalein, alizarine yellow R.
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.
litmus paper and pH scale i am not sure about the rest :)
potassium permanganate is a good example of self indicator
Indicators are used frequently for testing pH; but many other indicators exist for other compounds or ions.
the common indicators are universal indicator and litmus paper
Forex indicators are tools used to try and evaluate the market predictions. http://www.forexindicators.net/
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.
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.
Describe what chemists study and how chemistry is used
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
Indicators used outside the titration flask are termed as external indicators. A very commonly used external indicator is potassium ferricyanide
Dalton's symbols are not used in chemistry because it is very difficult to represent in chemistry
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....
I am currently studying Chemistry, and it mainly involves topics such as:AcidsAlkalisChemical ReactionsUniversal IndicatorsOxygen Reactions and other gasesSaltsand generally different chemical mixes etc.