What mass of potassium hydroxide, #KOH#, is required to make #250# #cm^3# of a #0.5# #M# solution? Chemistry Solutions Molarity 1 Answer David G. May 22, 2016 #250# #cm^3# = #0.25# #dm^3# (= #0.25# #L#) For a solution, #C=n/V# (concentration = number of moles/volume). Rearranging, #n=CV=0.50xx0.25=0.125# #mol# We need #0.125# #mol# of KOH and the molar mass of KOH is #56.1# #g# #mol^-1#, so #56.1xx0.125=7.0# #g#. We need #7.0# #g# of KOH. 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 65057 views around the world You can reuse this answer Creative Commons License