15. Among the hydrogen halides, the weakest bond is found in bond is found in and the shortest A) HF, HF B) HF, HI C) HI, HF D) HI, HI E) HC, НBr Rank the order of acidity or basicity of each set of molecules from strongest to weakest in the box provided. strongest base weakest base A B H strongest acid weakest acid A B

15. Among the hydrogen halides, the weakest bond is found in bond is found in and the shortest A) HF, HF B) HF, HI C) HI, HF D) HI, HI E) HC, НBr Rank the order of acidity or basicity of each set of molecules from strongest to weakest in the box provided. strongest base weakest base A B H strongest acid weakest acid A B

Organic Chemistry: A Guided Inquiry

2nd Edition

ISBN:9780618974122

Author:Andrei Straumanis

Publisher:Andrei Straumanis

Chapter4: Polar Bonds, Polar Reactions

Section: Chapter Questions

Problem 24E: Summarize the relationship between pKa and base strength by completing the followingsentences: a....

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As we shall see in Chapter 19, hydrogens on a carbon adjacent to a carbonyl group are far more acidic than those not adjacent to a carbonyl group. The anion derived from acetone, for example, is more stable than is the anion derived from ethane. Account for the greater stability of the anion from acetone.
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.
Use Table 13-2 to order the following from the strongest to the weakest acid. HClO2,H2O,NH4+,HClO4
Summarize the relationship between pKa and base strength by completing the followingsentences: a. For a given base, the higher the pKa of its conjugate acid, the stronger or weaker the base. b. For a given base, the lower the pKa of its conjugate acid, the stronger or weaker the base.
Gastric juice, the digestive ?uid produced in the stomach, contains hydrochloric acid, HCl, Milk of Magnesia, a suspension of solid Mg(OH)2 in an aqueous medium, is sometimes used to neutralize-excess stomach acid. Write a complete balanced equation for the neutralization reaction, and identify the conjugate acid—base pairs.
For the previous four questions, label each molecule that appears in the question or your answer asstrong acid, strong base, weak acid, or weak base.
rank the following species in order of increasing acidity. least acidic should be on top. CBrH2COOH CBr2HCOOH CH3COOH CBr3COOH
Which of the following is the CORRECT order of decreasing acidity?a) H2O ˃ NH3 ˃ HF ˃ CH4b) HF ˃ NH3 ˃ H2O ˃ CH4c) CH4 ˃ NH3 ˃ H2O ˃ HFd) HF ˃ H2O ˃ NH3 ˃ CH4
Arrange the following in the decreasing order of their basicity. Assign thereason :PH3, NH3, SbH3, AsH3, BiH3.