H.C.5.7 x 10-10-111.5 x 10-H.|C.7.9 х 10-12Br[HB*][OHB(aq) + H20(1)2 HB†(aq) + OH (aq)[B]The table above provides the chemical structures for weak bases and their ionization constants, K. Basedon the data, which of the following provides the best reason for the trend in base strengths?AThe number of hydrogen atomsThe number of resonance structuresThe different electronegativities of H, I, and BrThe different molar massesHO=U Question 14 aThe equilibrium for the reaction between (CH,),NH, a weak base, and water is represented by theequation below. The table shows the pH of three solutions of (CH,),NH(aq) at 25°C.(CH3),NH(aq) + H2O(1) 2 (CH,),NH,*(aq) + OH¯(aq)5.4 x 10-4 at 25°CKb[(CH3),NH]pH at 25°C0.05011.69Submit0.1011.850.2012.01A student mixes 100. mL of 0.200 M (CH3),NH(aq) with 100. mL of 0.200 M (CH3),NH2C1(aq)and claims that if a small amount of strong base is added to the mixture, then the resulting change in pH ofthe mixture will be smaller than the change in pH that would result from adding the same amount of strongbase to 200. mL of 0.200 M (CH3),NH(aq). Which of the following best explains whether or not thestudent's claim is correct?The claim is correct because the mixture contains only half of the (CH3),NH(aq) thatthe 0.200 M (CH3),NH(aq) contains. The lesser amount of base in the mixture makesthe pH of the mixture lower than the pH of the 0.200 M (CH3),NH(aq); therefore,when a small amount of strong base is added, the change in the pH of the mixture will besmaller than the change in the pH of the 0.200 M (CH3),NH(aq).AThe claim is correct because the mixture contains a significant amount of the acid(CH3),NH2"(aq), which can react with and partially neutralize the added strong base,thereby reducing the change in pH. In 0.200 M (CH3),NH(aq), the concentration ofthe acid (CH3),NH,™(aq) is very small; therefore, the added strong base is notneutralized and the change in pH will be larger.В+The claim is incorrect because the mixture contains only half of the (CH3),NH(aq) thatthe 0.200 M (CH3),NH(aq) contains. The lesser amount of base in the mixture makesthe pH of the mixture lower than the pH of the 0.200 M (CH3),NH(aq); therefore,when a small amount of strong base is added, the change in the pH of the mixture will belarger than the change in the pH of the 0.200 M (CH3),NH(aq).The claim is incorrect because the change in pH resulting from the addition of a smallamount of strong base to the mixture and to the 0.200 M (CH3),NH(aq) will be thesame given that the same amount of strong base is being added to the same volume ofsolution.

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H. 5.7 x 10 -10 1.5 x 10-11 || H 7.9 x 10-12 Br H. В (ад) + H2О(1) нв" (aq) + Он (ад) [HB"][OH [B] The table above provides the chemical structures for weak bases and their ionization constants, K,. Based on the data, which of the following provides the best reason for the trend in base strengths? The number of hydrogen atoms В The number of resonance structures The different electronegativities of H, I, and Br The different molar masses O=0 IO=U HO=0

H. 5.7 x 10 -10 1.5 x 10-11 || H 7.9 x 10-12 Br H. В (ад) + H2О(1) нв" (aq) + Он (ад) [HB"][OH [B] The table above provides the chemical structures for weak bases and their ionization constants, K,. Based on the data, which of the following provides the best reason for the trend in base strengths? The number of hydrogen atoms В The number of resonance structures The different electronegativities of H, I, and Br The different molar masses O=0 IO=U HO=0

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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