What can we use as an indicator for acids and bases?

Answer 1

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.

Answer 2

Red & Blue litmus paper.

Actually, there are many different indicators for you to try. Examples are red cabbage juice, blueberries, strong undecaf tea, spinach, beets, and onions. For these to work, you need the fluid. I found that boiling them for several minutes until the water is colored and then straining the solution is the best way to approach this.

Answer 3

Universal indicator, you can also make one using red cabbage and hot water. Boil water, crush red cabbage up with the water ,put red cabbage and water through filter paper and add the bit-less water to different acids and alkalies. It will come up with a colour on the pH scale.

Answer 4

Tried-and-true indicators include: thymol blue, tropeolin OO, methyl yellow, methyl orange, bromphenol blue, bromcresol green, methyl red, bromthymol blue, phenol red, neutral red, phenolphthalein, thymolphthalein, alizarin yellow, tropeolin O, nitramine, and trinitrobenzoic acid. Data in this table are for sodium salts of thymol blue, bromphenol blue, tetrabromphenol blue, bromcresol green, methyl red, bromthymol blue, phenol red, and cresol red.

Answer 5

litmus paper, methyl orange, phenolphthalein, turmeric juice, red-cabbage juice.

Answer 6

indicators for acid :- methyl yellow, methyl orange, bromophenol blue. indicators for base :- phenolphthalein, nile blue, thymolphthalein.

Answer 7

indecative juce you can get at any wood shops

Answer 8

litmus paper is the easiest