If there is more acid, the log of a fraction is negative, so the pH will be smaller than the pKa, and if there is more base, the log is positive, leading to a higher pH than the pKa. To get practice using the buffer solution equation, the {eq}HF/F^- {/eq} buffer solution ...
The lower thepH, the higher the concentration of hydrogen ions [H+]. The lower the pKa, the stronger the acid and the greater its ability to donate protons. The pH depends on the concentration of the solution. This is important because it means a weak acid could actually have a lower p...
On the contrary, when the ambient pH is higher than the value of pKa(PMAA), the grafted PMAA brushes swell and the resistance for trans-membrane mass-transfer is low; consequently, the enzymatic reaction in the capsule is in the active state due to the high permeability of substrates and ...
As a result, the calculated pKa’s of Asp164 from the simulations initiated from the earlier crystal structure are 0.8/1.6 units higher than the pKa from the simulation based on the recent crystal structure, because of the significant deviation between the two structures in this region (Fig. ...
we can predict whether a molecule will be protonated or deprotonated based on the connection between its pka and the ph of its solution. the molecule will be deprotonated if the ph is higher than the pka. q4 is pka the same as ph? it is important to remember that when the ph equals ...
It is generally believed that ionization of AAc in gels at pH higher than gel pKa leads to increase in hydrophilicity and charge repulsion and, consequently, elevation of water uptake.24 Hydro- gels Hl, H2, and H3 were prepared from the same poly- mer concentrations and comparable chemical ...
It is noteworthy that the collapse transition of P(NIPAAM-co-AAc) can be prevented by electrostatic repulsion between the deprotonated AAc, provided that the pH of the polymer is higher than the pKa of AAc (pKa ∼ 4.25) [36], [37]. With a temperature rise from 25 to 45 °C, the...
(pKa data for Glutamic acid was taken from [Champe, 2007]) We will see later how the IEP and the pH dependence of electrical charges of various substances are of importance in brewing. At a pH below its IEP the net charge of a molecule is always positive because the higher ...
Next we assayed activ- ity of LLO and Y406A at different pH values at room temperature and noticed significant loss of activity in Y406A at pH values higher than 6.5. At lower pH values the Y406A mutant still shows significant hemolytic activity, comparable to the wild-type protein (Fig...
A pH-induced conformational transition was found in bovine prolactin within the physiologically significant pH region from 6.5 to 8.5. The thermal stability of prolactin at pH 6.5 is essentially higher than at pH 8.5. Bovine prolactin binds zinc ions with an apparent association constant of 2 x ...