Determine the percent dissociation and pH of .2 M HNO2 in the presence of .3 M NO2

the old alchemists made significant contributions to science even though there starting premises were off a bit. their conclusions after failure would steer them into better directions for investigation. science is no more than close observation and the initial mistakes result in rethinking and retrying experiments.

oxygen, selenium, tellurium, and polonium.

they're all from the same group as sulfur (group 16).