Picric acid has been used in the leather industry and din etching copper. However, its laboratory use has been restricted bycause it dehydrates on standing and can become shock sensitive. It has an acid dissociation constant of .42. What is the [H3O+] for a .20M solution of picric acid?
a .022M
b. .052M
c. .15 M
d. .29M
e. None of these