Question

A solution turns thymolphthalein blue, alizarin yellow R orange, and indigo carmine blue. What is the possible range of pHs for the solution?
I got 10.6 - 11.4, is that correct?

Answer 1

Answer:

It is 10.2 - 12.0

Explanation:

Alizarin yellow produces a dull yellow-brown, transparent pigment when precipitated on an inert base that has poorer color stability than alizarin. The sodium salt of alizarin yellow is used as an aqueous acid-base indicator. It changes from yellow at pH 10.2 to red at pH 12.0.