Name: Pre-Lab Questions 1. write a reversible reaction for the buffer decomposition of NH4* into ammonia (NH3) and Ht ion NHq" laq) = NH3 (ag) + H *C0g 2. What side will the reaction from #1 shift to when HCl is added to the solution? NH3 is a base ond HCI IS on acid. NH3 lag) +HC (aq) NA4 SniFIS in the direction of reactant, NH 3. What side will the reaction from #1 shift to when LIOH is added to the solution? to left. > H2 O When Li OH i9 added it consumes H the reaction will shift towards for ward/right direction H t -HO 4. What is the pKa of the NHa" ion? This will be used in the laboratory. The pha of NHy is 9.26 5. Calculate the pH of a NH4* buffer system when 40.0 mL of 0.1 M NH3 is mixed with 40.0 mL of a 0.001 M NH4CI. The standard Value for Kb Of NH3= 1.8 x10 5 pOH -pKot 1og [NHy ] [N H3] pOH = - 109(1.8x 10 5) + log (901) > 2.7447 POH : PH= 14-pOH = 11. 255 6. Calculate the pH of a NH4* buffer system when 20.0 mL of 0.10 M NH3 is mixed with 10.0 mL of a pkb = -1ogkb 11.26 0.10 M NH4CI. 7. Calculate the pH of a NH4* buffer system when 10.0 mL of 0.10 M NH3 is mixed with 10.0 mL of a 0.010 M NH.CI. The d for the For (NHN tionnd ce h the soos BufferLab-5

Name: Pre-Lab Questions 1. write a reversible reaction for the buffer decomposition of NH4* into ammonia (NH3) and Ht ion NHq" laq) = NH3 (ag) + H C0g 2. What side will the reaction from #1 shift to when HCl is added to the solution? NH3 is a base ond HCI IS on acid. NH3 lag) +HC (aq) NA4 SniFIS in the direction of reactant, NH 3. What side will the reaction from #1 shift to when LIOH is added to the solution? to left. > H2 O When Li OH i9 added it consumes H the reaction will shift towards for ward/right direction H t -HO 4. What is the pKa of the NHa" ion? This will be used in the laboratory. The pha of NHy is 9.26 5. Calculate the pH of a NH4 buffer system when 40.0 mL of 0.1 M NH3 is mixed with 40.0 mL of a 0.001 M NH4CI. The standard Value for Kb Of NH3= 1.8 x10 5 pOH -pKot 1og [NHy ] [N H3] pOH = - 109(1.8x 10 5) + log (901) > 2.7447 POH : PH= 14-pOH = 11. 255 6. Calculate the pH of a NH4* buffer system when 20.0 mL of 0.10 M NH3 is mixed with 10.0 mL of a pkb = -1ogkb 11.26 0.10 M NH4CI. 7. Calculate the pH of a NH4* buffer system when 10.0 mL of 0.10 M NH3 is mixed with 10.0 mL of a 0.010 M NH.CI. The d for the For (NHN tionnd ce h the soos BufferLab-5

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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