Calculate either [h3o+] or [oh−] for each of the solutions at 25 °c. solution a: [oh−]=3.27×10−7 m solution a: [h3o+]= m solution b: [h3o+]=7.69×10−9 m solution b: [oh−]= m solution c: [h3o+]=0.000681 m solution c: [oh−]= m which of these solutions are basic at 25 °c? solution c: [h3o+]=0.000681 m solution a: [oh−]=3.27×10−7 m solution b: [h3o+]=7.69×10−9 m