Question

what are indicators? name two acid - base indicators​

Answer 1

Answer:

Examples of acid-base indicators include litmus paper, phenolphthalein, and red cabbage juice. An acid-base indicator is a weak acid or weak base that dissociates in water to yield the weak acid and its conjugate base or else the weak base and its conjugate acid. The species and its conjugate have different colors.

Answer 2

Explanation:

Indicators are the substances that tell us the nature of the substance , that whether it is a acidic , basic or neutral.

Two acid base indicators are :-

Phenolthpthtlen

Litmus paper

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Know more :-

Phenolthpthtlen is naturally colourless.

In acidic medium, it remains colourless.

In basic medium , it changes into pink colour.

Litmus paper , may have any colour naturally.

In acidic medium , they change from blue to red.

In basic medium, they change from red to blue.

Types of indicators :-

1. Natural :- They change the colour of the substance.

Eg :- Litmus.

2. Synthetic :- They also change the colour of the substance.

Eg :- Phenolthpthtlen.

3. Olfactory :- They change the smell of the substance.

Eg :- Onion.

# There are some indicators for blind also. Eg :- Vanilla escent.

# pH paper is a universal indicator . It changes the pH value according to the colour.

# pH means negative log ohlf H+ ion.

# pH is a scale , having numbers from 1 to 14.

:- 1 - 6 is acidic

1 - 3 Highly or strongly acidic.

3 - 5 Moderately acidic

5 - 7 Weakly acidic

:- 7 is neutral

:- 8 - 14 is basic

8 - 10 Weakly basic

10 - 12 Moderately basic

12 - 14 Strongly or highly basic