User:Sarah Burkhard/Notebook/471 Nano Notebook/2016/10/04

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UV Vis Silver Round 1 pH 4 - 12, Fructose 0 mM, 0.0625 mM Solutions prepared solutions with HCl, which made our samples ph 4 - 6 useless (AgCl forms and precipitates) we discarded pH 4 - 6 solutions and only measured absorbance for pH 7 - 12. Observations: all except pH 12 show precipitates. only pH 12 is a homogeneous, slightly orange solution. volumes and concentrations used: Fructose = 0.0 mM Fructose = 0.0625 mM we prepared pH 4 - 6 again, with HNO3 The above screen - shotted spreadsheet can be found in the Dropbox under "AG Stock Solution Calculation Template" We finished the UV Vis on Wednesday. Results The above chart shows the UV-Vis spectra for [Fructose]=0 mM, [Ag]=0.25 mM. Nanoparticles were only formed for pH 4, 11, and 12. All other pH solutions formed a cream colored precipitate, and did not appear to form nanoparticles from the spectra. The above chart shows the UV-Vis spectra for [Fructose]=0.0625 mM, [Ag]=0.25 mM. As with 0 mM fructose, nanoparticles were only formed for pH 4, 11, and 12. All other pH solutions formed a cream colored precipitate, and did not appear to form nanoparticles from the spectra. The absorbance at 530 nm is shown above for [Fructose]=0 mM, [Ag]=0.25 mM. As expected, solutions that did not form nanoparticles have an absorbance of ~0. The absorbance at 530 nm is shown above for [Fructose]=0.0625 mM, [Ag]=0.25 mM. As expected, solutions that did not form nanoparticles have an absorbance of ~0.