Is acid-catalyzed esterification an acid-base reaction? I would say that one could say this at certain points in the reaction mechanism, for example at the initial protonation of the carboxylic acid or the deprotonation of the carbenium ion at the end of the reaction mechanism. What do you all mean? Lg
Assumption: An amino acid with a COO group and an aromatic amino acid such as phenylalanine meet inside a protein, for example. As a result, COO is protonated to COOH. My question now is: Why is the pKa value increasing? I can't really explain it. When pKa=PH, half of a molecule is protonated and the…
Hello everyone, Chemistry is one of my biggest weaknesses, and here's a question I can't find an answer to anywhere. From the information provided, I can conclude that this is a weak acid. Since the pH is below 7, the solution is definitely acidic, but not strongly acidic. Using the formula pH = 1/2 *…
Hey, I have a question about amino acids and their different states in different pH ranges. Since I have to draw a peptide at pH 7, I would be interested in which protonation states the amino acids can assume. For example, in the case of aspartic acid, it is completely protonated in acidic conditions and…
Hey, I have a chemistry exam tomorrow (Q11) and I don't really understand this task or how to assign the pH value to the molecules/structural formulas. Thank you in advance for your answers!
Why is the area of absorbed light arranged like this? Doesn't, for example, especially in the first form, ie, orange charges, which would require a particularly short wavelength? Why is the third, protonated form yellow and therefore requires high energy?