What is the order of reaction for Phenolphthalein?

[Oblivion77]

1.The Problem
Above

The Attempt at a Solution

Thanks! I think it is first order but need some verification.

 

[Borek]

What reaction? Combustion? One of the four acid/base equilibria? Or some fancy organic modification?

Not that I will be able to answer, but at the moment even someone with PhDenoloftalein degree won't help.

 

[Oblivion77]

I should have specified, but the phenolphthalein was mixed with OH-, that still might not be enough information needed.

 

[Epsillon]

I think you need to have 2 of the following to be able to find order of reaction.

Reaction Rate, Time and Concentration.