what is an indicator in chemistry?
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What is the purpose of an indicator in chemistry? Indicators are substances which show whether the substance tested is basic or acidic. 1  pH indicator, a chemical detector for protons in acid-base titrations. 2  Redox indicator, a chemical detector for redox titrations.
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- Click for larger image. Acid and Base Indicators. Acid-Base Indicators: The most common method to get an idea about the pH of solution is to use an acid base indicator. An indicator is a large organic molecule that works somewhat like a  color dye. Whereas most dyes do not change color with the amount of acid or base present, there are many molecules, known as acid-base indicators, which do respond to a change in the hydrogen ion concentration. Most of the indicators are themselves weak acids. The most common indicator is found on litmus paper.
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- To learn more about why indicator molecules change color with pH, see Water to Wine. 1  Baking soda, NaHCO 3, fizzes when added to an acidic solution, but no change occurs in basic solution. 2  The reaction isn't easily reversible so baking soda is more of a spot test for acids than an indicator.
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Definition of 'indicator' Definition of 'indicator'. indicator (ɪndɪkeɪtəʳ ) An indicator is a measurement or value which gives you an idea of what something is like. ...vital economic indicators, such as inflation, growth and the trade gap. The number of wells is a fair indicator of the demand for water. Synonyms: sign, mark, measure, guide More Synonyms of indicator. 2. countable noun. A car's indicators are the flashing lights that tell you when it is going to turn left or right.
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- The indicator that is usually chosen for titrations involving iodine (triiodide) is starch. Starch forms a dark blue complex with iodine. The end point in iodimetry corresponds to a. sudden color change to blue. Likewise the end point in iodometry corresponds to a sudden loss. of blue color due to the complex.
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- An indicator may be needed. Often a titration is repeated until successive titres are within 0.1 cm 3. An indicator is a substance that undergoes a change in colour when the end-point of a titration is reached. Acid-base indicators are used to signal the end of acid-base titrations.
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Symbol (chemistry) In chemistry, a symbol is a code for a chemical element.It is usually derived from the name of the element, often in Latin. This is an example of an atomic symbol. The text boxes explain where the numbers are derived from.or example, He is the symbol for helium (English name, not known in ancient Roman times), Pb for lead (plumbum in Latin), W for tungsten (wolfram in German, not known in Roman times). Only the first letter is capitalized.
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- Indicator - Biology. 1  Indicator (genus), a genus of birds in the honeyguide family. 2  Environmental indicator of environmental health (pressures, conditions and responses) 3  Ecological indicator of ecosystem health (ecological processes) 4  Health indicator, which is used to describe the health of a population.
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- An indicator is a large organic molecule that works somewhat like a  color dye. Whereas most dyes do not change color with the amount of acid or base present, there are many molecules, known as acid - base indicators, which do respond to a change in the hydrogen ion concentration. Most of the indicators are themselves weak acids. The most common indicator is found on litmus paper.
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indicator A substance that undergoes an observable change, usually a change of colour, when a chemical alteration occurs in its environment. Indicators may demonstrate changes in acidity, the presence of various substances, such as sugar or protein in body fluids, or alterations in the concentrations of substances.
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What is the function of an indicator in a titration? Phenolphthalein. Phenolphthalein is another commonly used indicator for titrations, and is another weak acid. In this case, the weak acid is colourless and its ion is bright pink. Adding extra hydrogen ions shifts the position of equilibrium to the left, and turns the indicator colourless. Adding hydroxide ions removes the hydrogen ions from the equilibrium which tips to the right to replace them - turning the indicator pink.
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Symbol (chemistry) In chemistry, a symbol is a code for a chemical element. It is usually derived from the name of the element, often in Latin. This is an example of an atomic symbol. The text boxes explain where the numbers are derived from.
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- Tweet. Indicator species are plants and animals that, by their presence, abundance, lack of abundance, or chemical composition, demonstrate some distinctive aspect of the character or quality of an environment.
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INDICATOR Hyponyms (each of the following is a kind of indicator): absorption indicator (an indicator used in reactions that involve precipitation). acid-base indicator (an indicator that changes color on going from acidic to basic solutions).. (chemistry) a substance that changes color to indicate the presence of some ion or substance; can be used to indicate the completion of a chemical reaction or (in medicine) to test for a particular reaction. Familiarity information: INDICATOR used as a noun is uncommon. Dictionary entry details. • INDICATOR (noun).
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- An indicator is a chemical compound that changes colour and structure when exposed to certain conditions and is therefore useful for chemical tests. Litmus, for example, is … an indicator that becomes red in the presence of acids and blue in the presence of bases.+ 19 others found this useful. MikizuNg Vasabi.ndicator is a process which is used to find out the substanceis acid,base and salt. example: litmus paper and termuric both are natural indicator. example of artificial indic … ator: mithyl orange and phenolphtaceil. 4 people found this useful.
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Measuring pH with Litmus Paper Indicators are used to measure the pH of a substance. Often plant extracts will change colour if exposed to acidic or basic conditions and can therefore be used to indicate if a substance is an acid or base. Litmus is a pigment from a plant that is red under acidic conditions and blue under basic conditions.
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Acid - Base Indicators and Titrations Acid-Base Indicators and Titrations Acid-Base indicators (also known as pH indicators) are substances which change colour with pH. They are usually weak acids or bases, which when dissolved in water dissociate slightly and form ions.
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- Magic Pitcher Demonstration: Phenolphthalein is an indicator of acids (colorless) and bases (pink). Sodium hydroxide is a base, and it was in the pitcher at the beginning, so when added to the phenolphthalein in beakers 2 and 4, it turned pink (top half of the graphic).niversal Indicator, which is a solution of a mixture of indicators is able to also provide a full range of colors for the pH scale. A variety of indicators change color at various pH levels. A properly selected acid-base indicator can be used to visually indicate the approximate pH of a sample.
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- A neutral [neutral: A neutral solution has a pH of 7 because it has an equal concentration of hydrogen ions and hydroxide ions.] substance is pH 7 at 25°C. Indicators An indicator changes colour depending on the properties of the substance it is added to. 1  Three indicators are commonly used to show whether a solution is acidic or alkaline: 2  litmus. 3  phenolphthalein. 4  universal indicator.
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INDICATOR 4. (chemistry) a substance that changes color to indicate the presence of some ion or substance; can be used to indicate the completion of a chemical reaction or (in medicine) to test for a particular reaction. Familiarity information: INDICATOR used as a noun is uncommon.Dictionary entry details.• INDICATOR (noun).. (chemistry) a substance that changes color to indicate the presence of some ion or substance; can be used to indicate the completion of a chemical reaction or (in medicine) to test for a particular reaction. Familiarity information: INDICATOR used as a noun is uncommon. Dictionary entry details. • INDICATOR (noun).
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Acid - Base Indicators Acid - base indicators (also known as pH indicators) are substances which change color with pH. They are usually weak acids or bases. Consider an indicator which is a weak acid, with the formula HIn. At equilibrium, the following chemical equation is established. The acid and its conjugate base have different colors. At low pH, the concentration of H3O+ is high and so the equilibrium position lies to the left.
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Definitions &Translations one who, or that which, shows or points out; as, a fare indicator in a street car. Indicator (noun). a pressure gauge; a water gauge, as for a steam boiler; an apparatus or instrument for showing the working of a machine or moving part.
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What's in a name? On indicators, measures and metrics According to OECD/DAC, an indicator is: A quantitative or qualitative factor or variable that provides a simple and reliable means to measure achievement, to reflect changes connected to an intervention, or to help assess the performance of a development actor.
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Definitions &Translations indicator (Noun). Any of many substances, such as litmus, used to indicate the concentration of a substance, or the degree of a reaction. indicator (Noun). A plant or animal whose presence is indicative of some specific environment.indicator (Noun). A measure, such as unemployment rate, which can be used to predict economic trends.ny of many substances, such as litmus, used to indicate the concentration of a substance, or the degree of a reaction. indicator (Noun). A plant or animal whose presence is indicative of some specific environment. indicator (Noun). A measure, such as unemployment rate, which can be used to predict economic trends.