Name the three indicators used to distinguish between an acid and an alkali.? Plzzz urgent ans.

1. Litmus Paper

2. Methyl Orange
3. Universal Indicators

The three indicators commonly used to distinguish between an acid and an alkali are:

1. Litmus paper: Litmus paper is a dye-impregnated paper that changes color in the presence of an acid or an alkali. It turns red under acidic conditions and blue under alkaline conditions.

2. Phenolphthalein: Phenolphthalein is a colorless substance that turns pink or magenta in the presence of an alkali. It remains colorless in the presence of an acid.

3. Methyl orange: Methyl orange is an orange dye that turns red in the presence of an acid and yellow in the presence of an alkali. It is often used to distinguish between weak and strong acids or alkalis.

The three indicators commonly used to distinguish between an acid and an alkali are:

1. Litmus paper: Litmus paper is a filter paper that has been soaked in a natural dye extracted from lichens. It comes in two forms, blue and red. When an acid is added to blue litmus paper, it turns red, indicating that the substance is an acid. On the other hand, when an alkali is added to red litmus paper, it turns blue, indicating that the substance is an alkali.

2. Phenolphthalein: Phenolphthalein is a colorless chemical compound that turns pink or magenta when added to a solution with a pH greater than 8.2. This makes it a useful indicator to distinguish between acids and alkalis. When phenolphthalein is added to an acid, it remains colorless, indicating that the substance is acidic. However, when added to an alkali, it turns pink or magenta, indicating that the substance is alkaline.

3. Universal Indicator: Universal indicator is a mixture of several different dyes that produce a wide range of colors depending on the pH of the solution. It is typically used with a color chart to determine the approximate pH of a substance. In the presence of an acid, universal indicator displays colors ranging from red to yellow, while in the presence of an alkali, it exhibits colors ranging from green to blue and purple.

To use these indicators, you can simply dip a strip of litmus paper into the solution being tested or add a few drops of phenolphthalein or universal indicator directly into the solution. Observe any color changes to determine whether the substance is an acid or an alkali.