[cvn]

Can anyone tell me the chemical forumla of screened methyl orange?

[xiankai]

http://en.wikipedia.org/wiki/Methyl_orange

its formula name is a mouthful

[cvn]

thanks for that wiki site..
but what i am asking for is Screened Methyl Orange which has a different formula as the one you had given me..

[Borek]

Have you heard about Google? First hit when you search for screened methyl orange is "What is the difference methyl orange and screened methyl orange?" and it contains ALL the information you may need.

[cvn]

yes i read Google search results..
it says this: Screened methyl orange is a mixture of methyl orange and xylene cyanole FF (a redox indicator), 40:56. It changes colour at pH 3.8 -- 4.1 from violet to green.

but adding xylene cyanole FF doesnt change the chemical formula ? 

[cvn]

alright, so i guess i get the formula of methyl orange, and the formula of xylene cyanol

a mixture, so formula: C25H26N2O6S2 + C14H14N3O3SNa

[AWK]

Note, we do not use formulas for mixtures. Eventually, you can write down it in analogous way as for example Na2SO4.10H2O, but at least one of coefficient will be a real number.