CHEM 297 Study Guide - Quiz Guide: Tonic Water, Standard Deviation
23 Feb 2016
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Similar reason apply to the omission of the 0. 6 concentration data for both wavelength graph of the standard addition graph observed below. The 0. 6 concentration was omitted because it significantly increases the r2 value from. For conc(ppm)= 25. 34 (calculated from excel, using linear regression tool) But the uncertainty associated based on experimental absorbance can be calculated using. 2 = 3. 62*10-5 for wavelength = 450. 3nm excel, using the regression tool, and so sx0 t=12. 706 so. The concentration of diluted quinine is thus 0. 2725ppm 0. 0242 tsx0= 3. 62 10 5 12. 706=0. 0242. Using the same formula, we get for wavelength = 483. 15. The concentration of diluted quinine is thus 0. 268094ppm 0. 0206. Hence, the true concentration of quinine sulphate is formulated by multiplying both this value and the error by 250 and by 391. 47/324. 47, hence: True concentration of quinine sulphate in indian tonic water is thus. Sm * n = s = 0. 04183 3 = 0. 0724539.
