indicate whether the following are acidic, basic, or neutral solution
H3O+ = 10^-7
pH = 2
H3O+ = 10^-10
pH = 9
H3O+ = 10^-1
H3O+ = 10^-7
pH = 2
H3O+ = 10^-10
pH = 9
H3O+ = 10^-1