in·di·ca·tor ˈin-də-ˌkāt-ər. : a substance (as a dye) used to show visually (as by a change in color) the condition of a solution with respect to the presence of a particular material (as a free acid or alkali) litmus and phenolphthalein are acid-base indicators.
What is meaning of indicator in chemistry?
Indicators are weak acids or weak bases that show a change in colour as the concentration of Hydrogen ions in a solution changes or the pH of a solution changes. The indicators dissociate slightly in the water to form ions. Some examples of indicators are Litmus, turmeric, phenolphthalein, etc.
What is indicator and its uses?
Indicators are substances which show a change in colour when brought in contact with acids and bases. The most common indicator used in the laboratory is the litmus. It is extracted from lichens and is available either in the form of solutions or in the form of strips of paper known as litmus paper.
What are the 3 types of indicators?
Indicators can be described as three types—outcome, process or structure – as first proposed by Avedis Donabedian (1966).
What are indicators simple definition? – Related Questions
What are 5 types of indicators?
Type of indicators
Input indicators. These indicators refer to the resources needed for the implementation of an activity or intervention.
Process and output indicators.
Outcome indicators.
Impact indicators.
Targets.
Monitoring.
IMCI health facility indicators.
Indicators for assessing infant and young child feeding practices.
What is indicator in chemistry titration?
Titration refers to the act of adding a known solution to an unknown solution in order to complete the reaction. Indicator: The final point is indicated either by the physical change in the reaction or by the addition of an auxiliary reagent is known as an indicator.
What is an indicator in chemistry class 10?
Indicators: Indicators are those substances which tell us whether a substance is acidic or basic by change in colour. For e.g., litmus solution. Olfactory indicators: Those substances whose odour changes in acidic or basic media are called lfactory indicators. For e.g., clove, vanilla, onion.
Why are indicators used?
An indicator is used in the process of titration. This is added in the analyte, which is added in the conical flask, and to this the titrant from the burette is added. Indicator is the substance that changes or imparts certain color at the stoichiometric end point of the titration.
How do indicators work?
Indicators are substances whose solutions change color due to changes in pH. These are called acid-base indicators. They are usually weak acids or bases, but their conjugate base or acid forms have different colors due to differences in their absorption spectra.
What are the types of indicators?
Type of indicators
Input indicators. These indicators refer to the resources needed for the implementation of an activity or intervention.
Process and output indicators. Process indicators refer to indicators to measure whether planned activities took place.
Natural Indicator is a type of indicator that can be found naturally and can determine whether the substance is an acidic substance or a basic substance. Some examples of natural indicators are red cabbage, turmeric, grape juice, turnip skin, curry powder, cherries, beetroots, onion, tomato, etc.
What is a good indicator?
Characteristics of good indicators
Valid: accurate measure of a behaviour, practice, task that is the expected output or outcome of the intervention. Reliable: consistently measurable over time, in the same way by different observers. Precise: operationally defined in clear terms.
What is an indicator answer?
An indicator is any substance that gives a visible sign, usually by a colour change, of the presence or absence of a threshold concentration of a chemical species, such as an acid or an alkali in a solution. For example, a substance called methyl yellow imparts a yellow colour to an alkaline solution.
What is the colour of vanilla in acid?
Indicators
Indicator
Original colour
Acid
Phenolphthalein
Colourless
Colourless
Methyl orange
Orange
Red
Onion
n/a
No change
Vanilla
n/a
No change
Which of the following changes its odor in basic medium?
Detailed Solution
The correct answer is Olfactory indicators. The substances whose odour changes in an acidic or basic medium are called olfactory indicators.
Is clove oil acidic or basic?
Clove is discovered to be exceptionally acidic.
Is onion base or acid?
Onions are acidic in every form and variety. Whether raw, cut, red, yellow, Green, or white, all onions are acidic in nature. Because onions pH level is 5 to 5.8 depending on cooked or raw onions. As onions pH is less than 7, so onions are acidic.
Which acid is in milk?
The real acidity of milk is due to lactic acid. This is never found in milk when it is first drawn from the udder. It is produced by the action of the lactic acid organisms on the milk sugar. The so-called apparent acidity of milk is what gives fresh milk its acid reaction.
