When a student added a few drops of methyl orange indicator to a colourless solution, the solution turned red. Which of the following should he add in excess so that the colour changes to yellow ?
(1) NaOH solution
(2) H₂SO₄ solution
(3) Lemon juice
(4) Vinegar solution

Correct answer: (1) NaOH solution

Explanation: Methyl orange turns red in the acidic solution and yellow in basic solution. Hence, to convert it to the yellow colour, the student needs to add an excess of the basic solution as sodium hydroxide is a strong base, it can change the colour of the solution to yellow.

Tutorialspoint

Simply Easy Learning

Updated on: 10-Oct-2022

198 Views

Kickstart Your Career

Get certified by completing the course

Get Started