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An ammonia gas-sensing electrode gave the following calibration points when all
Chapter 14, Problem 14-E(choose chapter or problem)
An ammonia gas-sensing electrode gave the following calibration points when all solutions contained 1 M NaOH. NH3 (M) E (mV) NH3 (M) E (mV) 1.00 105 268.0 5.00 104 368.0 5.00 105 310.0 1.00 103 386.4 1.00 104 326.8 5.00 103 427.6 A dry food sample weighing 312.4 mg was digested by the Kjeldahl procedure (Section 10-8) to convert all nitrogen into NH4 . The digestion solution was diluted to 1.00 L, and 20.0 mL were transferred KPot Na,H 36 to a 100-mL volumetric flask. The 20.0-mL aliquot was treated with 10.0 mL of 10.0 M NaOH plus enough NaI to complex the Hg catalyst from the digestion and diluted to 100.0 mL. When measured with the ammonia electrode, this solution gave a reading of 339.3 mV. Calculate the wt% nitrogen in the food sample. 14-F.
Questions & Answers
QUESTION:
An ammonia gas-sensing electrode gave the following calibration points when all solutions contained 1 M NaOH. NH3 (M) E (mV) NH3 (M) E (mV) 1.00 105 268.0 5.00 104 368.0 5.00 105 310.0 1.00 103 386.4 1.00 104 326.8 5.00 103 427.6 A dry food sample weighing 312.4 mg was digested by the Kjeldahl procedure (Section 10-8) to convert all nitrogen into NH4 . The digestion solution was diluted to 1.00 L, and 20.0 mL were transferred KPot Na,H 36 to a 100-mL volumetric flask. The 20.0-mL aliquot was treated with 10.0 mL of 10.0 M NaOH plus enough NaI to complex the Hg catalyst from the digestion and diluted to 100.0 mL. When measured with the ammonia electrode, this solution gave a reading of 339.3 mV. Calculate the wt% nitrogen in the food sample. 14-F.
ANSWER:Step 1 of 3
The percentage of nitrogen in a food sample is given by using the formula,
