Does the bonding of OH- increase or decrease pH? If it decreases pH, that would mean OH- and H+ lose their pH influence when bonded to an element of molecule, and that pH is really a matter of free floating OH- and K+ -doesn't it?
2007-01-21 07:22:27 · 2 answers · asked by Lisa 1 in Science & Mathematics ➔ Chemistry
This reaction will dramatically INCREASE the pH of the solution.
pH is a function of the concentration of H+ ions in solution.
The higher the concentration of H+ ions, the Lower the pH.
Pure water has a pH of 7, neutral. There are equal concentrations of H+ ions and OH- ions. If something were to be done to the water so that the H+ ion concentration went down (or the OH- concentration went up) relative to the other then the pH would increase.
That is what is happening in the above/below reaction with Potassium metal and water.
In this reaction,
2K (s) + 2H2O (l) → 2KOH (aq) + H2 (g)
You are creating Potassium Hydroxide...a strong base, which will disassociate completely into K+ and OH- ions when dissolved in water. When you dissolve KOH in water, the OH- concentration in the water will rise and thus the overall pH of the water will rise. The K+ ion has no effect on the pH of water.
pH = -log [H+]
Where [H+] is the concentration of H+ ions in terms of Molarity (moles of H+ per Liter of solution).
Similarly,
pOH = -log [OH-]
pH + pOH = 14
2007-01-21 08:06:37 · answer #1 · answered by mrjeffy321 7 · 0⤊ 0⤋
It actually decreases the pH because you have xtra hydrogens floating around.
It would get more acidic. pH level is matter of xtra OH- or H+ in the solution. thats why its called pH meter. there is also pOH meter.
pH is for -log of concentration of Hydroniums. H3O+
pOH is for -log of concentration of hydroxides. OH-
2007-01-21 07:40:23 · answer #2 · answered by Mafia 4 · 0⤊ 1⤋