Chemistry, 06.12.2019 05:31 aidanfbussiness
Ahistidine is involved in an interaction with a glutamic acid that stabilizes the charged form of the histidine, such that the value of ∆go for deprotonation is 15 kj•mol –1 at ph 7.0 and 293 k (calculated using the biochemical standard state). what is the pka of this histidine
Answers: 2
![\Delta{G^0} =-RT \ln \frac{[His]}{[His+]}](/tpl/images/0405/9157/4e649.png)
![15\ kJ/mol=-0.008314\ kJ/Kmol\times 293\ K\times \ln \frac{[His]}{[His+]}](/tpl/images/0405/9157/bf88f.png)
![\frac{[His]}{[His+]}=e^{\frac{15}{-0.008314\times 293}](/tpl/images/0405/9157/52880.png)
![\frac{[His]}{[His+]}=0.00211](/tpl/images/0405/9157/5687d.png)
![pH=pKa+log\frac{[His]}{[His+]}](/tpl/images/0405/9157/43e17.png)
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