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Types of Redox Reactions

What indicato...

Question

What indicator should be used for the titration of 0.10 M $K H_{2} B O_{3}$ with 0.10 M $H C l$ ? $K_{a} (H_{3} B O_{3}) = 7.2 \times 10^{- 10}$

Methyl red

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Phenol red

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Phenolphthalein

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Malachite green

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Solution

The correct option is A Methyl red
The indicator methyl red is used for the titration of strong acid against a weak base. $H C l$ is a strong acid and $K H_{2} B O_{3}$ is a weak base.

Hence, they can be titrated by using methyl red indicator.

Option A is correct.

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Similar questions

K_{a}

7.3 \times 10^{- 10}

(H_{3} B O_{3})

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

What indicator should be used (in terms of its $p K_{i n}$ )for the titration of 0.10 M $K H_{2} B O_{3}$ with 0.10 M $H C l$ ?

X^{-} N a^{+}

(0.1 M, 10 m L)

0.1 M

H C l

K_{b (X^{-})} = 10^{- 6}

10 m L

H C l

40 m L

0.10 M

N a O H

20 mL

0.1 M

N a_{2} C O_{3} \cdot N a H C O_{3} \cdot 2 H_{2} O

0.05 M H C l

x mL

H C l

y mL

H C l

(y - x)

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