Indicators

Subject: Science

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Overview

An indicator is a substance which changes color in the presence of acids or alkalis. The pH scale is a standard scale, which is used for measuring the approximate strength of an acid or an alkali solution. This note provides an information about the indicator, its type and features.
Indicators

An indicator is a substance which changes color in the presence of acids or alkalis. In the laboratory, we use three indicators. These are litmus, phenolphthalein, and methyl orange.

Indicator Acid Base
Red litmus No change in color Blue in color
Blue litmus Red in color No change in color
Phenolphthalein Colorless Rose color
Methyl orange Red in color Yellow in color

Turmeric powder mixed with water is a bright orange-yellow which turns a brick red in the presence of alkali. Indicator can be prepared by boiling, mashing and straining a finely chopped beetroot. Many red or blue colored flowers contain natural dyes which can be used as indicators.

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pH Scale

The pH scale is a standard scale, which is used for measuring the approximate strength of an acid or an alkali solution.

The pH scale has ranged from 1 to 14. Acidic solutions have a pH value less than 7 while alkaline solutions have a pH value greater than 7. Distilled water has pH value 7 and is called neutral substance. Strong acids have pH value 1 or 2 while strong alkali's have pH value 13 or 14.

From the pH scale, we can say that higher the hydrogen ion concentration, lower is the pH value and vice versa.

Things to remember
  • An indicator is a substance which changes color in the presence of acids or alkalis.
  • In the laboratory, we use three indicators. These are litmus, phenolphthalein and methyl orange.
  • Many red or blue colored flowers contain natural dyes which can be used as indicators.
  • It includes every relationship which established among the people.
  • There can be more than one community in a society. Community smaller than society.
  • It is a network of social relationships which cannot see or touched.
  • common interests and common objectives are not necessary for society.
Videos for Indicators
Natural Indicators
Universal indicator
What are Indicators and how do we use them?
Questions and Answers

An indicator is a chemical substance which has capacity to show the termination of a chemical reaction by changing its colour.

The types of indicators are: litmus paper, phenolphthalein, methyl orange and turmeric.
An indicator is used to test whether a substance is acid or base.

Blue litmus turns into red in an acidic medium.

Red litmus turns to blue in basic medium.

The pH scale is a standard scale, which is used for measuring the approximate strength of an acid or an alkali solution. The pH scale has ranged from 1 to 14.

Turmeric powder mixed with water is a bright orange-yellow which turns a brick red in the presence of alkali.

The pH scale is a standard scale, which is used for measuring the approximate strength of an acid or an alkali solution.The pH scale has ranged from 1 to 14. Acidic solutions have a pH value less than 7while alkaline solutions have a pH value greater than 7. Distilled water has pH value 7 and is called neutral substance. Strong acids have pH value 1 or 2 while strong alkali's have pH value 13 or 14.

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