<P> pOH is sometimes used as a measure of the concentration of hydroxide ions . OH . pOH values are derived from pH measurements . The concentration of hydroxide ions in water is related to the concentration of hydrogen ions by </P> <Dl> <Dd> (O H −) = K W (H +) (\ displaystyle (\ mathrm (OH) ^ (-)) = (\ frac (K_ (W)) ((\ mathrm (H) ^ (+))))) </Dd> </Dl> <Dd> (O H −) = K W (H +) (\ displaystyle (\ mathrm (OH) ^ (-)) = (\ frac (K_ (W)) ((\ mathrm (H) ^ (+))))) </Dd> <P> where K is the self - ionisation constant of water . Taking logarithms </P>

Solutions with high ph values have which of these properties