Question

An alkali is titrated against an acid with methyl orange as indicator, which of the following is a correct combination ?

• A. Base - Weak, Acid - Strong, End point - Yellow to pinkish red
• B. Base - Strong, Acid - Strong, End point - Pink to colourless
• C. Base - Weak, Acid - Strong, End point - Colourless to pink
• D. Base - Strong, Acid - Strong, End point - Pinkish red to yellow

Answer 1

The correct option is A Base - Weak, Acid - Strong, End point - Yellow to pinkish red

Methyl orange shows pinkish-red color in acidic medium & yellow color in the basic medium. Since the original solution is basic so the initial color is yellow & titrated with acid so the final color is pinkish-red.

Therefore option $A$ is correct.