PH/equilibrium constant question?

If methyl orange is used as an indicator and the ratio of the acid to base form is 1.64, find the pH.

Answer:
The pKa of MO is 3.7

http://ibchem.com/ib/ibnotes/full/aab_ht...

The Henderson-Hasselbalch equation is:

pH = pKa + log [base form / acid form]

http://en.wikipedia.org/wiki/henderson-h...

So,

pH = 3.7 + log (1 / 1.64)

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