What are indicators and how many types of indicators are there?
Answers
Answer:
A pH indicator is a halochromic chemical compound added in small amounts to a solution so the pH of the solution can be determined visually. Hence, a pH indicator is a chemical detector for hydronium ions or hydrogen ions in the Arrhenius model.
Common Acid Base Indicators
pH Scale and Acid and Base Indicators. The pH range functions between 0 to 14 with 7 being neutral. ...
Litmus Paper. ...
Phenolphthalein Indicator. ...
Bromothymol Blue Indicator. ...
Methyl Red Indicator. ...
Universal Indicator.
An indicator is a substance that changes its colour in acidic and basic medium.An indicator shows one colour in acidic medium and different colour in basic medium so that they are called indicators. eg:-Litmus , turmeric
medium so that they are called indicators.
eg:-Litmus , turmeric
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There are 3 types of indicators
● Natural lndicators
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lndicators derived from natural sources are called natural indicators.
eg:- Litmus , red cabbage , turmeric , china rose petals etc..
● Synthetic indicators
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lndicators prepared in laboratary are callwd synthetic indicators.
eg:- Phenophtaline , methyl orange etc..
● Olfactory indicators
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lndicators which give different odours in acidic and basic medium.
eg:-Onion , vanila essence etc...