Determine whether the following hydroxide ion concentrations ([oh−]) correspond to acidic, basic, or neutral solutions by estimating their corresponding hydronium ion concentrations ([h3o+] using the ion product constant of water (kw). hydronium ion concentration [h3o+] solution condition greater than 1×10−7 m acidic equal to 1×10−7 m neutral less than 1×10−7 m basic it may to keep the following equation in mind as you work kw = [h3o+][oh−] = [1×10−7 m][1×10−7 m] = 1×10−14 m