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Q.

Phenolphthalein of pH range 8 – 10 is used in which of the following types of titration as a suitable indicator?


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a

<math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>NH</mi><mn>4</mn></msub><mi>OH</mi></math> and HCl

b

<math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>NH</mi><mn>4</mn></msub><mi>OH</mi></math>and HCOOH

c

<math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>NH</mi><mn>4</mn></msub><mi>OH</mi></math> and <math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi mathvariant="normal">C</mi><mn>2</mn></msub><msub><mi mathvariant="normal">H</mi><mn>4</mn></msub><msub><mi mathvariant="normal">O</mi><mn>2</mn></msub></math>

d

NaOH and<math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi mathvariant="normal">C</mi><mn>2</mn></msub><msub><mi mathvariant="normal">H</mi><mn>4</mn></msub><msub><mi mathvariant="normal">O</mi><mn>2</mn></msub></math> 

answer is D.

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Detailed Solution

Concept- Indicators are substances that communicate or indicate whether a substance is acidic or basic in nature by showing some change in its physical properties.
Usually indicators such as phenolphthalein, methyl orange or litmus change colour to indicate the change in pH.
Phenolphthalein indicator is colourless in acidic solutions and turns pink in basic solutions. Its pH range is 8.2 (colourless) -10.0 (pink).
The pH range 8-10, indicates the equivalence point should have the solution of strong base with weak acid in the titration process. So the weak acid is <math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi mathvariant="normal">C</mi><mn>2</mn></msub><msub><mi mathvariant="normal">H</mi><mn>4</mn></msub><msub><mi mathvariant="normal">O</mi><mn>2</mn></msub></math> and the strong base is NaOH.
Hence, the correct option is 4.
 
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Phenolphthalein of pH range 8 – 10 is used in which of the following types of titration as a suitable indicator?