2019年1月25日 · 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 ...

2015年12月21日 · $\begingroup$ 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.

2014年4月9日 · 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

5 天之前 · What is the pKw of water? Here is the first step to convincing you that the pKa of water should not be 7: water is clearly a weaker acid than hydrogen sulfide, whose pKa is 7.04, or boric acid, 9. ...

To be called a strong acid in an aqueous system, the acid has to dissociate completely, or at least almost completely. An acid with a $\mathrm{p}K_\mathrm{a}$ of, say, 2 added to neutral water at a concentration of, say, 1 mol/L would not dissociate much. In fact, approximately 90% of it would be in the acid form (protonated) and only ...

2016年8月26日 · 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.

5 天之前 · The pKa value of water is approximately 15.7. This value indicates that water is a weak acid. The pKa value of water impacts its chemical properties by determining its ability to donate or accept ...

2022年11月16日 · 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 ...

2023年6月6日 · $\begingroup$ 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 …

2024年5月21日 · What is the pka of nh3? The pKa of NH3 is around 38-39. NH3 is a weak base and its pKa value represents the equilibrium constant for its reaction with water to form NH4+ and OH-.