An alkali is titrated against an acid with methyl orange as indicator, which of the following is a correct combination?
Base | Acid | End point | |
A. | Weak | Strong | Pink to yellowish brown |
B. | Strong | Strong | Pinkish red to yellow |
C. | Weak | Strong | Yellow to pinkish red |
D. | Strong | Strong | Pink to colourless |
Text Solution
Verified by ExpertsC
range for methyl orange is
Generally, weak bases have 
greater than 7. When methyl orange is added to a weak basic solution, solution becomes yellow. This solution is then titrated against a strong acid, at the end point 
will be less than 3.1. Thus, the solution will become pinkish red from yellow.
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