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: Principles and Mechanisms (Second Edition)
- (a) Given that Kb for ammonia is 1.8 x10-5 and that forhydroxylamine is 1.1 x 10-8, which is the stronger base?(b) Which is the stronger acid, the ammonium ion or thehydroxylammonium ion? (c) Calculate Ka values for NH4+and H3NOH+.arrow_forwardWhat would the structure and net charge of y- Aminobutyric acid (GABA) be at pH = 1?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
- please make the explanation clear and thank you for your helparrow_forwardAmino acids, such as glycine, are the key building blocks of proteins and will be discussed in greater detail in Chapter 25. At the pH of the stomach, glycine exists predominantly in a protonated form in which there are two acidic protons of interest. The pk, values for these protons are shown. Using this information, draw the form of glycine that will predominate at physiological pH of 7.4. pK₂=9.87 Glycine -] PK.-2.35arrow_forwardWhy do HCl, HNO3 etc. show acidic characters in aqueous solution while solutions of compounds like alcohol and glucose do not show acidic character?arrow_forward
- The acid HA has pKa 7.00. (a) Which is the principal species, HA or A, at pH 6.00? (b) Which is the principal species at pH 8.00? (c) What is the quotient [A]/[HA] at (i) pH 7.00; (ii) at pH 6.00?arrow_forwardWhy do HCl, HNO3, etc. show acidic characters in aqueous solutions while solutions of compounds like alcohol and glucose do not show acidic character?arrow_forward(a) Given that Ka for acetic acid is 1.8 x 10-5 and that forhypochlorous acid is 3.0 x 10-8, which is the stronger acid?(b) Which is the stronger base, the acetate ion or the hypochloriteion? (c) Calculate Kb values for CH3COO- and ClO-.arrow_forward
- Write the Henderson-Hasselbalch equation for a solution of methylamine. Calculate the quotient [CH3NH2]/[CH3NH13] at (a) pH 4.00; (b) pH 10.632; (c) pH 12.00.arrow_forwardSeveral examples of the nitrogenous, heterocyclic bases for the nucleotides of DNA and RNA are shown below. In each molecule, determine if the labeled nitrogen atoms are "pyridine like" or "pyrrole like". In addition, state whether each nitrogen would be basic (capable of accepting an acidic proton) or neutral (not capable of accepting an acidic proton). Thymine Adenine NH₂arrow_forward(b) Calculate the pH of 0.0005 mol dm3 ethanoic acid when its pKa = 4.75 CH3COOH( CH3COO() + H™ Ka = pH =arrow_forward
- Chemistry for Today: General, Organic, and Bioche...ChemistryISBN:9781305960060Author:Spencer L. Seager, Michael R. Slabaugh, Maren S. HansenPublisher:Cengage LearningIntroduction to General, Organic and BiochemistryChemistryISBN:9781285869759Author:Frederick A. Bettelheim, William H. Brown, Mary K. Campbell, Shawn O. Farrell, Omar TorresPublisher:Cengage Learning