How would I answer these questions? I have gotten $an$ answer but I want $to$ confirm $imon$ the right way. Here are $my$ questions: $1.$ What $is$ the concentration $of$ the $OH-$ ion $in0\mathrm{.}03MHCl?2.$ What molarity $of$ butanoic acid $(pKa=4\mathrm{.}82)$ would have $apHof3\mathrm{.}0?$