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Universal Indicator

The indicator...

Question

The indicator which shows colour change in the entire pH range is ________.

A

phenolphthalein

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B

methyl orange

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C

universal indicator

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D

thymol blue

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Solution

The correct option is B universal indicator
A universal indicator is a $p H$ indicator composed of a solution of several compounds that exhibits several smooth colour changes over a $p H$ value range from $1 - 14$ to indicate the acidity or alkalinity of solutions.
Phenolphthalein acts in $p H$ range $8.2 - 13,$ methyl orange acts in pH range $3.1 - 4.4$ and thymol blue in range from $3.8$ to $5.4$ $p H$ .

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K_{b}

M e O H

an indicator is

10^{- 9}

p H

at which it shows a colour change is

Q. For a series of indicators, the colours and pH range over which colour change takes are as follows:

Indicator	Colour change over pH range
U	Yellow to blue pH 0.0 to 1.6
V	Red to yellow pH 2.8 to 4.1
W	Red to yellow pH 4.2 to 5.8
X	Yellow to blue pH 6.0 to 7.7
Y	Colourless to red pH 8.2 to 10.0

Which of the following statements is/are correct?

Q. For a series of indicators, the colours and pH range over which colour change takes place are as follows

Indicator	Colour change over pH range
U	Yellow to blue pH 0.0 to 1.6
V	Red to yellow pH 2.8 to 4.1
W	Red to yellow pH 4.2 to 5.8
X	Yellow to blue pH 6.0 to 7.7
Y	Colourless to red pH 8.2 to 10.0

Which of the following statements is correct?

Q. Assertion :In the acid-base titration involving a strong base and a weak acid, methyl orange can be used as an indicator. Reason: Methyl orange changes its colour in pH range

3

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_{a}

6.8

is Bromothymol blue. During an acid base titration, at what approximate pH, will bromothymol blue undergo a color change?

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