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In order to determine acidic, basic or neutral character of solutions, a student tabulated the following results after experimentation. Which of the following observations has been tabulated correctly? Case Test Solution Colour change on red litmus paper Colour change on blue litmus paper Acidic/Basic/Neutral A NaOH No change Red Acidic B Sour Milk Blue No change Neutral C Vinegar No change No change Neutral D Washing soda Blue No change Basic

In order to determine acidic, basic or neutral character of solutions, a student tabulated the following results after experimentation. Which of the following observations has been tabulated correctly? Case Test Solution Colour change on red litmus paper Colour change on blue litmus paper Acidic/Basic/Neutral A NaOH No change Red Acidic B Sour Milk Blue No change Neutral C Vinegar No change No change Neutral D Washing soda Blue No change Basic Correct Answer D

Concept :

  • Litmus paper is an acid/base indicator that changes colour and is used to distinguish between bases and acids.
  • These are used extensively to verify a substance's acidity or alkalinity in laboratories and educational institutions.
  • Litmus is a pigment produced from naturally occurring compounds, like lichens (fungi), of which Roccella tinctoria is the most widely used species. 
  • Blue litmus paper is prepared by treating plain paper with lichen-blue litmus.
  • Red litmus is similarly prepared but a small percentage of sulfuric or hydrochloric acid is added to cause it to turn red.

Key PointsFor Acids:

  • Under acidic conditions, blue litmus paper turns red and stays the same in basic conditions.
  • An acid is material in an aqueous solution that releases hydrogen ions.
  • Acids such as sulphuric acid, hydrochloric acid, nitric acid, ethanoic acid, citric acid, vinegar, Sour Milk etc. are usually tested with blue litmus paper.

For Base:

  • Under basic condition red litmus paper turn blue while red litmus paper remain red in acidic solution.
  • An acid is material in an aqueous solution that releases hydroxide ions.
  • Bases such as NaOH, Washing soda, Lime water etc. are usually tested with red litmus paper.

Explanation:

Case

Test Solution

Colour change on red litmus paper

Colour change on blue litmus paper

Acidic/Basic/Neutral

  

A

NaOH

No change

Red

Acidic

 Inorrect

B

Sour Milk

Blue

No change

Neutral

 Inorrect

C

Vinegar

No change

No change

Neutral

 Inorrect

D

Washing soda

Blue

No change

Basic

 Correct
  • NaOH - Basic
  • Sour Milk - Acidic
  • Vinegar CH3COOH - Acidic
  • Washing Soda (Na2CO3) - Basic

Hence we can conclude that option D is correct.

Related Questions

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