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Normality

Indicator ran...

Question

Indicator range of methyl red is:

A

4.2 to 6.3

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B

5 to 7

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C

8.3 to 10

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D

12 to 14

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Solution

The correct option is A 4.2 to 6.3
Methyl red shows colour change in acidic range.

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Similar questions

Q. Assertion :In the acid-base titration involving strong base and weak acid, methyl red can be used as an indicator. Reason: Methyle red changes its colour in the

p H

4.2

6.3

A solution gives the following colours with different indicators:

(A) Methyl orange $\Rightarrow$ yellow (B) Methyl red $\Rightarrow$ yellow (C) Bromo thymol blue $\Rightarrow$ Orange What is the pH of the solution?

Indicator	pH range
Methyl violet	0.3-1.8
Methyl orange	2.8-3.8
Congo red	2.8-4.8
Methyl red	3.8-6.1
Bromothylmol blue	6.0-7.9
Phenol Red	6.8-8.6

The table above shows the pH ranges of some common indicators. Given that

K_{a}

7.3 \times 10^{- 10}

(H_{3} B O_{3})

, Choose an indicator that can be used for the titration of

0.10 M K H_{2} B O_{3}

with 0.10 M HCl.

Q. The variation of pH during the titration of 0.5 N

N a_{2} C O_{3}

with 0.5 N HCI is shown in the given graph, the following table indicates the colour and pH ranges of different indicators :

Indicator	Range of colour change	colour in acid	colour in base
Thymol blue	1.2 to 2.8	Red	Yellow
Bromocresol red	4.2 to 6.3	Red	Yellow
Bromothymol blue	6.0 to 7.6	Yellow	Blue
Cresolphethalain	8.2 to 9.8	Colourless	Red

Based on the graph and the table, which of the following statements are true?

Q. An indicator

H I n

has a standard ionization constant of

9.0 \times 10^{- 9}

. The acid colour of the indicator is yellow and the alkaline colour is red. The yellow colour is visible when the ratio of yellow form to red form is

30

1

and the red colour is predominant when the ratio of red form to yellow form is

2

1

p H

range of the indicator?

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