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What will an indicator do in the presence of an acid or base?
This indicator changes his color.
What color does litmus paper change if base or paper?
When litmus paper touches an acid, the paper changes to red. When it touches a base, the paper changes to blue. By comparing the color the litmus paper changed to by a chart, you could determine how strong or weak that acid or base is.
What substance changes color when exposed to an acid or base?
An indicator is a substance that changes color when exposed to an acid or base.
What colors do litmus paper and phenolpthalein turn in presence of an acid or of base?
Litmus paper: red color in acidic solutions and blue color in basic solutions.Phenolphthalein: no color in acidic solutions.
What is an indicator as related to an acid and a base?
It is a substance(chemical or natural) which changes colour in the presence of an acid or base.
A substance used to indicate the presence of an acid base or neutral?
These substances are named pH indicators. See a list on the link bellow.
What color does blue litmus turn when exposed to an acid or base?
Blue litmus turns red in the presence of an acid and remains blue in the presence of a base.
Is an indicator color change an acid or base?
depends on the indicator used. in case of red litmus... changes to blue for basesand no change in acids blue litmus - changes to red in acids, no change in bases phenolpthelin - changes to pink in bases, no change in acid methyl orange - changes to red in acids and yellow golden in bases
If phenolphthalein is added to HBr?
If phenolphthalein is added to HBr (hydrobromic acid), which is a strong acid, the phenolphthalein indicator will remain colorless because it only changes color in the presence of a base. Since HBr is an acid, it will not cause the indicator to change color.
What color does BTB turn when mixed with a acid or a base?
Bromothymol blue (BTB) turns yellow in the presence of an acid and blue in the presence of a base.
A substance such as litmus that signals the presence of something?
An indicator is a substance that changes color in response to the presence of specific substances in a solution. Litmus is a common indicator that changes from blue to red in the presence of an acid and from red to blue in the presence of a base. This color change helps to identify the nature of the solution being tested.
What are substances which exhibit a specific color in the presence of acid or base?
an indicator
