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Question

While titrating dilute HCl solution with aqueous NaOH, which of the following will not be required?


A

Bunsen burner and measuring cylinder

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B

Burette and porcelain tile

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C

Clamp and phenolphthalein

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D

Pipette and distilled water

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Solution

The correct option is A

Bunsen burner and measuring cylinder


Explanation for correct option:

A. Bunsen burner and measuring cylinder:

  1. Bunsen burner and measuring cylinder are not used while titrating dilute HCl solution with aqueous NaOH.
  2. In the acid-base titration, there is no use of a bunsen burner and measuring cylinder.

Explanation for incorrect option:

B. Burette and porcelain tile:

  1. Burette and porcelain tile is used while titrating dilute HCl solution with aqueous NaOH.
  2. Burette is used to deliver a chemical solution with a known concentration into a flask and the burette brush is used to scrub the inside wall.
  3. Porcelain tile is placed underneath the conical flask to aid with ease of spotting the endpoint color change.

C. Clamp and phenolphthalein:

  1. Phenolphthalein is a commonly used indicator for titrations and it is a weak acid.
  2. It is used in titration as it changes color close to pH7.
  3. The clamp is used to ensure that the burette does not move during the experiment and it also makes it easier to read the volume accurately.

D. Pipette and distilled water:

  1. A pipette filler is used in titration to draw up the solution until the bottom of the meniscus is on the line.
  2. It is later released into a conical flask.
  3. Distilled water is also used in titration to remove distilled CO2 which is present in all water.

While titrating dilute HCl solution with aqueous NaOH, Bunsen burner and measuring cylinder will not be required.


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