6.) One way to determine the amount of nitrogen in a sample is through a method called Kjeldahl Method. In this method, the nitrogen in the sample is converted first to ammonium ions (N ? NH4+). The ammonium ions are then converted to ammonia by making the solution basic with the use of sodium hydroxide (NH4+ ? NH3). The ammonia produced is reacted with hydrochloric acid (NH3 +HCl ? NH4Cl). The unreacted hydrochloric acid is then titrated with standard sodium hydroxide solution. Using the method outlined, a 1-mL fish sample was analyzed. The liberated ammonia was collected in 100 mL of 0.0503 M HCl. The unreacted HCl then required 28.3 mL of 0.124 M NaOH for titration. Calculate the nitrogen in the sample as mg N/mL.

HCl is monobasic acid and NaOH is monoacidic base Therefore, for neutralization, moles of NaOH used…

Answered: 6.) One way to determine the amount of…

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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6.) One way to determine the amount of nitrogen in a sample is through a method called Kjeldahl Method. In this method, the nitrogen in the sample is converted first to ammonium ions (N ? NH₄⁺). The ammonium ions are then converted to ammonia by making the solution basic with the use of sodium hydroxide (NH₄⁺ ? NH₃). The ammonia produced is reacted with hydrochloric acid (NH₃ +HCl ? NH₄Cl). The unreacted hydrochloric acid is then titrated with standard sodium hydroxide solution. Using the method outlined, a 1-mL fish sample was analyzed. The liberated ammonia was collected in 100 mL of 0.0503 M HCl. The unreacted HCl then required 28.3 mL of 0.124 M NaOH for titration. Calculate the nitrogen in the sample as mg N/mL.

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