Question

A universal indicator is made by dissolving methyl orange, bromothymol blue and phenolphthalein in alcohol. Which of the following processes could best be used to separate the methyl orange component from the universal indicator solution?
A. Chromatography
B. Filtration
C. Distillation
D. Decantation

Answer 1

Hint:Methyl orange and other components of the universal indicator solution have different affinities to an adsorbent. This is because they have different molecular structures and different intermolecular forces of attraction.

Complete answer:
You can use the filtration when you have a precipitate formed or crystals formed. With the help of filtration technique, you separate crystals or precipitate from solution.
You can use the technique of distillation when you have a mixture of two or more liquids having significant differences in boiling points. If the boiling points of the individual components of the mixture are close enough, then you cannot use distillation technique to separate the mixtures.
You can use the technique of decantation when a solid substance is settled at the bottom in a beaker containing a liquid.
To prepare a universal indicator you dissolve methyl orange, bromothymol blue and phenolphthalein in alcohol.
To separate the methyl orange component from the universal indicator solution, you can use chromatography.

Hence, the correct option is the option A.

Note:
The method of chromatography is used for the separation of coloured pigments and dyes. Chromatography is also used for the purification of products obtained in the organic synthesis.