Question

4 REPORT SHEETS: COLORIMETRIC ANALYSIS OF ASPIRIN Dene Cocda Name Name of partner all data and results in ink, include units, and use appropriate significant figures Report 4.1 DATA FOR CALIBRATION PLOT Stock solution salicylic acid concentration:一一nosm Volume of Stock Standardsolution used Salicylic Acid Concentration (M) Absorbance @540 nm mL 0.00 1.00 2 2.00 L Blank 00x 16m 250 516 3.00 (e 340x 10-4m 4.00 Equation of the linear fit to your calibration plot R2 value (Correlation coefficient) = 4.2 SAMPLE DATA Mass of synthesized aspirin sample Absorbance of synthesized aspirin solution
Find R^2 value and list two factors that can affect the R^2 value.

Answer 1

concentration Absorbance y 1770x+0.0062 0 1.00E-04 2.00E-04 3.00E-04 4.00E-04 0.004 0.202 0.35 0.51 0.735 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 0.00005 0.0001 0.00015 0.0002 0.00025 0.0003 0.00035 0.0004 0.00045 Linear equation y 1770x + 0.0062 R2 0.9948 Factors affecting R2 1, Instrument calibration can affect the R2 values 2. Dilution make from the stock solution are diffenent then the noted observation