Question

Define :- (a) Alkalies (b) Indicators.​

Answer 1

Answer:

A chemical that acts like a base and reacts strongly with acids, especially a hydroxide or carbonate of an alkali metal. The American Heritage® Student Science Dictionary, Second Edition.

Indicators are substances whose solutions change color due to changes in pH. These are called acid-base indicators. They are usually weak acids or bases, but their conjugate base or acid forms have different colors due to differences in their absorption spectra.

Answer 2

Alkalies :-

Bases which are soluble in water are called alkalies.

Indicators:-

An indicator is a 'dye' that changes colour when it is put in an acid or a base. The three most common indicators are: Litmus, Methyl orange and Phenolphthalein.

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