Concept explainers
Interpretation:
The structure of the most abundant form of histidine at given pH values is to be drawn.
Concept introduction:
The general form of an
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ORGANIC CHEMISTRY E-BOOK W/SMARTWORK5
- Use the value of the pK1 provided to deduce the structures of the following oxo acids. Acid pK1 H5IO6 2 H3PO2 2arrow_forwardWill 3-methylhexanoic acid be positive or neutral with an pH of 6.38?arrow_forwardGiven that Kb for ammonia is 1.8 * 10-5 and that for hydroxylamine is 1.1 * 10-8, which is the stronger base?arrow_forward
- calculate the percentage of ethylenediamine in the predominant form at pH 6.043, pKb1 of ethylenediamine is 4.072 and pKb2 is 7.152 please answer in percentagearrow_forwardWhat can you conclude regarding the difference in degree of acidity and alkalinity between organic and inorganic compounds? ( sample substances are dilute hcl, dilute acetic acid, dilute nh4oh and aniline).arrow_forwardCan a base such as sodium hydroxide be used to synthesize alum, instead of potassium using hydroxide to synthesize alum? Why or why not?arrow_forward
- Of two possible structures A and B for the conjugate acid of guanidine, the more stable is the one that is better stabilized by electron delocalization. Which one is it? Write resonance structures showing this electron delocalization.arrow_forwardCalculate the pH of 1.25x10^-2 M of the decongestantephedrine hydrochloride if the pKb of ephedrine (itsconjugate base) is 3.86.arrow_forwardA dibasic organic acid has a neutralization equivalent of 45+1. Deduce the structure of this organic acidarrow_forward
- Can any functional groups on Risperidone ionize? If so, which ones? Under what conditions? What are the pKa values of these functional groups? Write the structures in their correct ionization state at physiological pH.arrow_forwardThe pKa values of the conjugate acids of 2-aminopyridine (6.71) and 4- aminopyridine (9.11) are as shown. Which nitrogen is the more basic in these structures and why?arrow_forwardThe pKa values of the carboxylic acid groups of oxaloacetic acid are 2.22 and 3.98. a. Which carboxyl group is the stronger acid? b. The amount of hydrate present in an aqueous solution of oxaloacetic acid depends on the pH of the solution: 95% at pH 0, 81% at pH 1.3, 35% at pH 3.1, 13% at pH 4.7, 6% at pH 6.7, and 6% at pH 12.7. Explain this pH dependence.arrow_forward