When a student added a few drops of methyl orange indicator to a colourless solution, the solution turned red. Which of the following should be added in excess so that the colour changes to yellow?

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NaHC O_{3}

solution

H_{2} S O_{4}

solution

Lemon juice

Vinegar solution

answer is A.

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Detailed Solution

NaHC O_{3}

must be added in excess to change the colour to yellow.
Methyl orange when added to an acid turns its colour changes to red and when added to a basic solution the colour changes to yellow. So to change the red colour of the solution, a base needs to be added such that the colour becomes yellow. Therefore, out of all the above given options only 1 is a base. Thus,

NaHC O_{3}

solution is to be added by the student.

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