Exercise A Calculate $H_3{O}^{+}$when the $O{H}^{-}$has the following values: $1[O{H}^{-}]=1\mathrm{.}0{10}^{-10}2[O{H}^{TT}]=1\mathrm{.}0{10}^{-5}3[O{H}^{TT}]=1\mathrm{.}0{10}^{-7}4[O{H}^{-}]=1\mathrm{.}2{10}^{-4}5[O{H}^{TT}]=3\mathrm{.}5{10}^{-8}$ Exercise B Calculate $OH$ when the $H_3{O}^{+}$has the following values: $1[H_3{O}^{+}]=1\mathrm{.}0{10}^{-3}2[H_3{O}^{+}]=1\mathrm{.}0{10}^{-10}3[H_3{O}^{+}]=1\mathrm{.}0{10}^{-6}4,[H_3{O}^{+}]=2\mathrm{.}8{10}^{-13}$