(Solved): 1. Calculate the concentration of a solution prepared by adding 15.00mL of 2.04103MKMnO from ...

1. Calculate the concentration of a solution prepared by adding $15.00\mathrm{mL}$ of $2.04\times 10^{?3}\mathrm{M}\mathrm{KMnO}$ from a buret into a $50.00\mathrm{mL}$ volumetric flask, which is then filled to the $50.00\mathrm{mL}$ graduation mark with distilled water. Hint: M 2. A linear standard curve of ${\mathrm{KMnO}}_4$ is prepared from a set of standard solutions by plotting absorbance (y) vs. concentration (x). Use Logger Pro (as described in the Data Analysis for this experiment), or Google Sheets/Excel, to plot this standard curve using the data in Table 1. Help with spreadsheets [PDF] Table 1: Data for the standard curve of ${\mathrm{KMnO}}_4$ After plotting the standard curve, enter its slope below (not the equation of the line). Report your answer to 3 significant figures. If your answer ends in one or more zeros, use scientific notation. Slope $=$ $M^{?1}$ 3. Suppose that an unknown sample is analyzed spectrophotometrically at the same wavelength that was used for the standard curve and the absorbance was found to be 0.192 . Use the standard curve to find the concentration of the unknown. Hint: