What is the real pKa of water? - Chemistry Stack Exchange
Jan 25, 2019 · When molarity is the chosen unit water must be expressed as a molarity and the pKa = 15.74. The approximation is then made that the concentration of water in dilute solutions is [almost] constant and the equation is modified by multiplying both sides by the concentration of pure water resulting in subtracting 1.74 from 15.74 to give pKw [Not ...
Is methanol more acidic than water? - Chemistry Stack Exchange
Dec 21, 2015 · $\begingroup$ Water is a complicated substance. Water molecules solvated by water are anomalously acidic due to unusual stabilization of the conjugate base ($\ce{OH^{-}}$) by very strong hydrogen bonds. Water in a non-aqueous solvent (especially aprotic solvents) suffers a decrease in acidity by many orders of magnitude more than one might expect.
What is the pKa of the hydronium, or oxonium, ion (H3O+)?
Apr 9, 2014 · The pKa of H3O^+ is 0.0. The pKa of water is 14.0. As a simple proof, the pKa of the Na+ ion in water is 13.9
Why is the pKa of a ketone higher than of water?
Dec 18, 2016 · The pKa of water is 16, while the pKa of a ketone, HC3(CO)CH3, is closer to 20. The lower the pKa the stronger the acid. When a ketone loses a hydrogen, the NBE are resonance stabilized into the carbonyl group, lowering their energy, increasing the acidity. When a proton is removed from water, the NBE have no resonance structures.
Methanol vs water. Acidic strength - Chemistry Stack Exchange
Jan 25, 2019 · The question is based on the assumption, that water has a pKa of 15.7 which is usally not correct. As a paper mentioned in this thread What is the Real Pka of WATER the pKa of water in water should be 14.It might be different when water is a reactend in organic solvents, for that the paper mentioned by the thread author is helpful.
acid base - Is methanol really more acidic than water? - Chemistry ...
Aug 26, 2016 · So it would seem, water is more acidic than methanol. But an answer to the question mentioned above gives a good reasoning for why methanol is more acidic than water (it doesn't deal with the pKa of water, though). Also, the answer mentions that water would be much worse an acid in DMSO.
What is Pka for normal water in room temperature? - Answers
May 24, 2024 · NaCN doesn't really have a pKa. In water it becomes Na^+ and CN^-. The CN^- is a base so it will have a Kb and pKb. If you want the pKa of the conjugate acid (HCN), you can find that from 1x10^-14/Kb.
What is the pH of acetone in water? - Chemistry Stack Exchange
Jun 6, 2023 · $\begingroup$ This is a nonsense question. the acidity in water pKa=~15 and acetone pKa ~19 comes from the water. The mechanisms sequester H+ or OH- Were the reactions fast and favorable enough to affect water they would be more obvious. were the ketoform a strong enough Lewis to totally react to the more acidic enol form the discussion would ...
Why do we take active mass of water 1 but while calculating pKa …
Nov 16, 2022 · First, I should mention that the question was already asked here:Why is active mass of a pure solid or liquid always taken as unity? But while calculating $\\mathrm{p}K_\\mathrm{a}$ of pure water we ...
4-Bromophenol vs 4-aminophenol pKa in water comparison …
Jun 9, 2019 · Considering that, we can argue that 4-bromophenol has a lower pKa(is more acidic) than 4-aminophenol. And indeed, a quick google search validates my answer, the pKa of 4-bromophenol is 9.17 and the pKa of 4-aminophenol is 10.30 for the $\ce{-OH}$ group.