Question
An alkali is titrated against an acid with methyl orange as indicator, which of the following in a correct combination?
An alkali is titrated against an acid with methyl orange as indicator, which of the following in a correct combination?
A.
(a)
B.
(b)
C.
(c)
D.
(d)
Answer :
(c)
Solution :
$$pH$$ range for methyl orange is
\[\xleftarrow[\text{Pinkish red}]{}3.9-4.5\xrightarrow[\text{Yellow }]{}\]
Generally, weak bases have $$pH$$ greater than 7. When methyl orange is added to a weak base solution, solution becomes yellow. This solution is then titrated by a strong acid and at the end point pH will be less than 3.1.
∴ Solution becomes pinkish red.
$$pH$$ range for methyl orange is
\[\xleftarrow[\text{Pinkish red}]{}3.9-4.5\xrightarrow[\text{Yellow }]{}\]
Generally, weak bases have $$pH$$ greater than 7. When methyl orange is added to a weak base solution, solution becomes yellow. This solution is then titrated by a strong acid and at the end point pH will be less than 3.1.
∴ Solution becomes pinkish red.
.PNG "Preparation and Properties of Compounds mcq option image")
