Chapter 2, Problem 61P

The following are equivalent ways of asking about the acidity of an H atom: • What is the most acidic H on the molecule? • Which H is associated with the published pKa value? • Which H on the molecule is easiest to remove? • Which H on the molecule takes the least energy to remove? • Which bond to an H is most polarized? • For which H atom is removal least uphill in energy? • Which bond to an H atom, when broken, results in the lowest PE conjugate base? We will often find the last of these questions is easiest to answer. To do this, find all the different Hatoms on the molecule, and draw all possible conjugate bases.Only the lowest-energy one is the “real” conjugate base. Identify this structure, and you have found the most acidic H. Use this strategy to find the most acidic H on each of the following molecules. Note: Each structure hasat least three different kinds of H’s, so draw at least three unique conjugate bases for each.

Answer true or false to the following statements about the mechanism of acid-base reactions. (a) The acid and base must encounter each other by a collision in order for the proton to transfer. (b) All collisions between acids and bases result in proton transfer. (c) During an acid-base reaction the lone pair on the base fills the A-H antibonding sigma orbital.

Help me which one is right?

Predict the conjugate acid of CH₃O⁻.   A. CH3OH B. CH3OH2+ C. CH2O2- D. CH3O

1. A. The conjugate base of HCO3− is CO32− HCO3− H2CO3 B. The conjugate acid of HCO3- is CO32−   HCO3− H2CO3 C. The conjugate base of H2O is OH− H2O H3O+ D. The conjugate acid of H2O is OH− H2O H3O+ E. What is the conjugated base of each of the following acids in water: HClO4; H2S; HCO3-; H2PO-4F. What is the conjugated acid of each of the following bases in water: SO4-2; H2O; HCO3-; HPO4-2

What is the conjugate base of HBz+?  A. HBzB. Bz-C. BzD. H2Bz+

Compare compounds I and Il and choose the best statement from the list below. Vs. column I compound II a. The basicity of the compounds I and Il cannot be compared. b. Compound I is MORE basic than the compound II. c. Compound Il is MORE basic than the compound I. d. Both compounds have the same basicity ZI

Which of the statements are true? A. A conjugate acid is the protonated form of a Bronsted base. B. A conjugate base is the ionized form of a Bronsted acid. C. Conjugate acid = OH- + conjugate base

Which of the following aqueous solutions should demonstrate the most nonideal behavior? Select one: a. 0.1 M Nal b. 0.2 M CuSO4 c.0.5 M KBr d. 2.0 M CuCl₂ e. 2.5 M CSCI X