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Published on: July 19, 2019
Comparative proton transfer efficiencies of hydronium and hydroxide in aqueous solution: proton transfer vs Brownian
Nizam Uddin1, Jeongmin Kim, Bong June Sung
1Department of Chemistry and Green-Nano Materials Research Center, College of Natural Sciences, Kyungpook National University , Taegu 702-701, Republic of Korea.
Abstract:
With the help of QM/EFP-MD with modern correlated quantum theories, distinctly different proton transport dynamics for hydronium and hydroxide ions was revealed. The efficiency of proton transfer for hydronium was found to be significantly higher than that for hydroxide, and the difference in efficiency increased as the temperature was lowered. This difference in dynamics suggests that molecular Brownian diffusion may play an important role in hydroxide transport. Our theoretical findings are consistent with recent experimental observations of proton transfer in amorphous solid water.
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A titration is carried out for 25.00 mL of 0.100 M HCl (strong acid) with 0.100 M of a strong base NaOH. The pH at different volumes of added base solution can be calculated as follows:
(a) Titrant volume = 0 mL. The solution pH is due to the acid ionization of HCl. Because this is a strong acid, the ionization is complete and the hydronium ion molarity is 0.100 M. The pH of the solution is then:
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