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An indicator changes colour in the presense of acidic and basic solutions. It will be one colour for acidic solutions, and another color for basic solutions. With some indicators, the intensity of the color increases with the intensity of the acidity of 'basic-ness' of the solution. Cabbage is a natural indicator. An Acid turns pink and a base turns green

Examples of acid-base indicators: 1.) Litmus Paper acidic solutions will turn the blue litmus paper to red while basic solutions will turn the red litmus paper to blue

2.) Congo Red basic solutions will change the color of the entire solution into blue
There are many indicators, some of them are :

-Solution of red cabbage, or rose flower, strawberry, or cherry.These turn lighter(yellowish) in the presence of an acid, and more darker(violet) in the presence of a base.

-Phenolphtaline : It is a chemical solution that remains colour-less in the presence of an acid, and violet in the presence of a base.

-Red/Blue Litmus Paper : the RLP turns blue in the presence of a base, and the BLP turns red in the presence of an acid.

And finally you can use a pH meter or pH paper to indicate the indentity of the solution.

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Related Questions

What is a litmus paper and how to use it?

A litmus paper is a indicator that is used to test for acids or bases


What colour changes what acids and bases are added to rose indicator?

acids-magenta bases-green


How do you test of acids an bases?

using an universal indicator, or you can use litmus paper or a pH meter.


Is an indicator's reaction in acids and bases a chemical change?

No, an indicator's reaction in acids and bases is a physical change. Indicators change color based on the pH of the solution they are in, but the chemical composition of the indicator remains the same.


How are acids and bases tested?

universal indicator or litmus paper


Chemical that changes colour in acids and bases?

It's an indicator.


What is blue used for?

Brom blue is an indicator for acids and bases.


What is brom blue used for?

Brom blue is an indicator for acids and bases.


What is an '' indicator'' in the field of chemistry that deals with acids and bases?

A giant dinosaur


Can strong and weak acids and strong and weak bases be determined by using an indicator?

yes


How does a pH indicator separate acids from bases?

A pH indicator changes color depending on the acidity or basicity of the solution it is in. In an acid, the indicator will have one color and in a base, it will have a different color. By observing the color change in the pH indicator, one can determine whether the solution is acidic or basic.


What color change does each indicator show to represent acids bases and neutral?

There are far too many indicators to give them all. Litmus is blue in alkali, red in acids and an in-between colour often called claret when neutral. Universal indicator is red in strong acids, blue in strong alkalis and different colours in between depending on the brand.