a. A lab student analyzed a cooled Ni-en complex to determine the ethylenediamine, en, content. A 0.334 g sample of the synthesized Ni-en complex was dissolved in about 50 mL of water and titrated with 0.243 M HCI (aq). Endpoint required 21.01 mL of the HCI (aq). What is the mass (in grams) of en (MW of en = 60.10 g/mole) in the Ni-en complex analyzed? g en + 2 HCI → H₂en²+ + 2 Cl b. Continuing on with the analysis of the Ni-en complex as found in part a, 30 mL of dimethylglyoxime (DMG) solution was added to the 0.334 g of the titrated Ni-en complex solution. The resulting beautiful red complex, Ni(DMG)₂ (MW= 288.94 g/mole) was collected by filtration and found to weigh 0.233 g after 20 minutes in the oven. What is the mass (in grams) of Ni in the Ni-en complex analyzed? Ni²+ + 2 DMG → Ni(DMG)2 (s) 9 c. Determine the empirical formula of the complex synthesized in parts a and b. CA. [Ni(en)3]SO4-4H₂O B. [Ni(en)2(H₂O)₂]SO4-3H₂O C. [Ni(en)2(H₂O)₂]SO4-3H₂O D. [Ni(en)3]SO4.7H₂O CE. [Ni(en) (H₂0)4]SO4-4H₂0

a. A lab student analyzed a cooled Ni-en complex to determine the ethylenediamine, en, content. A 0.334 g sample of the synthesized Ni-en complex was dissolved in about 50 mL of water and titrated with 0.243 M HCI (aq). Endpoint required 21.01 mL of the HCI (aq). What is the mass (in grams) of en (MW of en = 60.10 g/mole) in the Ni-en complex analyzed? g en + 2 HCI → H₂en²+ + 2 Cl b. Continuing on with the analysis of the Ni-en complex as found in part a, 30 mL of dimethylglyoxime (DMG) solution was added to the 0.334 g of the titrated Ni-en complex solution. The resulting beautiful red complex, Ni(DMG)₂ (MW= 288.94 g/mole) was collected by filtration and found to weigh 0.233 g after 20 minutes in the oven. What is the mass (in grams) of Ni in the Ni-en complex analyzed? Ni²+ + 2 DMG → Ni(DMG)2 (s) 9 c. Determine the empirical formula of the complex synthesized in parts a and b. CA. [Ni(en)3]SO4-4H₂O B. [Ni(en)2(H₂O)₂]SO4-3H₂O C. [Ni(en)2(H₂O)₂]SO4-3H₂O D. [Ni(en)3]SO4.7H₂O CE. [Ni(en) (H₂0)4]SO4-4H₂0

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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Question

a. A lab student analyzed a cooled Ni-en complex to determine the ethylenediamine, en, content. A 0.334 g sample of
the synthesized Ni-en complex was dissolved in about 50 mL of water and titrated with 0.243 M HCI (aq). Endpoint
required 21.01 mL of the HCI (aq). What is the mass (in grams) of en (MW of en = 60.10 g/mole) in the Ni-en complex
analyzed?
g
en + 2 HCI
H₂en²+ + 2 CI™
b. Continuing on with the analysis of the Ni-en complex as found in part a, 30 mL of dimethylglyoxime (DMG) solution
was added to the 0.334 g of the titrated Ni-en complex solution. The resulting beautiful red complex, Ni(DMG)2 (MW =
288.94 g/mole) was collected by filtration and found to weigh 0.233 g after 20 minutes in the oven. What is the mass (in
grams) of Ni in the Ni-en complex analyzed?
Ni²+ + 2 DMG → Ni(DMG)2 (s)
CD. [Ni(en)3]SO4.7H₂O
CE. [Ni(en) (H20)4]SO4-4H₂0
9
c. Determine the empirical formula of the complex synthesized in parts a and b.
A. [Ni(en)3]SO4-4H₂0
B. [Ni(en)2(H₂O)₂]SO4-3H₂0
C. [Ni(en)2(H₂O)2]SO4-3H₂O

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