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Question

Name the indicator which can give us an idea of how strong or weak an acid or base is.

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Solution

Universal indicator like ph paper or ph solutions give us an idea of how strong or weak an acid or base is.

Now an indicator is a substance, which is used to determine the end point in a titration. In acid-base titrations, organic substance (weak acids or weak bases) are generally used as indicators. They change their colour within a certain pH range. The colour change and the pH range of some common indicators are tabulated below:-

Table : Colour changes of indicators with pH

Indicator

pH range

Colour

Acid solution

Base solution

Methyl yellow

2.9 – 4.0

Red

Yellow

Methyl orange

3.1 – 4.4

Pink

Yellow

Methyl red

4.2 – 6.3

Red

Yellow

Litmus

5.0 – 8.0

Red

Blue

Phenolphthalein

8.3 – 10.0

Colourless

Pink


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