Thursday, April 29, 2021

Acids, Bases and Salts | Class 10 | Activity 2.6 with Solution

Activity 2.6  
  • Take about 2 mL of dilute NaOH solution in a test tube and add two drops of phenolphthalein solution.
  • What is the colour of the solution?
  • Add dilute HCl solution to the above solution drop by drop.
  • Is there any colour change for the reaction mixture?
  • Why did the colour of phenolphthalein change after the addition of an acid?
  • Now add a few drops of NaOH to the above mixture.
  • Does the pink colour of phenolphthalein reappear?
  • Why do you think this has happened?

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