If the hydronium ion concentration of a solution is #1.63 * 10^-8# #M#, what is the hydroxide ion concentration? Chemistry Solutions Molarity 1 Answer anor277 Aug 13, 2016 #pH+pOH=14#, in aqueous solution at #298K# Explanation: If #[H_3O^+]=1.63xx10^-8#, then #pH=-log_10(1.63xx10^-8)#. And #[HO^-]# #=# #10^(pH-14)#, which should be less than #7#. Why so? Answer link Related questions what is the molarity of 20.0 ml of a KCl solution that reacts completely with 30.0 ml of a 0.400... How can molarity and osmolarity be calculated from mass per unit volume? How can molarity be used as a conversion factor? How high can molarity be? How does molarity change with temperature? How do you find molarity of a solution? What is the molarity of 10 NaOH? What is the molarity of 3 hydrogen peroxide? What is the molarity of a solution that contains 3.2 mol of solute in 0.98 L of solution? What is molarity? See all questions in Molarity Impact of this question 3576 views around the world You can reuse this answer Creative Commons License