1. The problem statement, all variables and given/known data Estimate the Ka the using the assumption that the color change can be seen by our eyes when [ln-]/[Hln] = 1/10 to see the acid form or [ln-]/[Hln] = 10/1 to see the color associated with the base. Use these numbers with your measured [H+] to calculate a Ka for each indicator you measured. 2. Relevant equations acid-base base-acid H+ Phenolphthalein 8.7 7.4 8.91E-09 I got the hydronium concentration by taking taking the average of the ph values and doing 10^-ph. How do i get the ka estimates? Do i set up the equation like this: ka = 1/[H+] or something like this?