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Lab#6 - %NH4 in solution Mass of Unknown(g x 100 0.2211(g x...

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Experiment #6 Kjeldahl Ammonium Analysis Approximate weight of Boric Acid used: 5g Molarity of HCl used 0.1130M Masses of Unknown Unknown # Mass 1 0.2211g 2 0.2536g 3 0.2352g Titration of conjugate base of Boric acid with HCl Sample # Initial Volume Final  Volume Used 1 (0.2211g) 31.4719ml 31.2508ml 29.25ml 2 (0.2536g) 31.2505ml 30.9967ml 34.00ml 3 (0.2352g) 30.9956ml 30.7604ml 31.30ml
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Unformatted text preview: %NH4+ in solution [( ) / Mass of Unknown (g) ] x 100% [( ) / 0.2211(g) ] x 100%= = 26.96% NH4+ Sample # 1 2 3 Volume of HCl used 29.25ml 34.00ml 31.30ml Mass of sample 0.2211g 0.2536g 0.2352g % of NH4+ 26.96% 27.33% 27.13% Mean Value for %NH4+ = (26.96%+27.33%+27.13%)/3 = 27.1% ± 0.1% Standard Deviation= ± 0.1%...
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