1. To determine the concentration of analyte A, the sample is titrated with the titrant B. Since both A and B can absorb electromagnetic radiation of 550 nm, the end point is to be detected spectrophotometrically at 550 nm. The shape of the titration curve at 550 nm would most closely resemble which of the following?(A) (B)(C)(D)(E)

3. The vitamin C content in a bottle of juice is determined by a titration method with potassium iodate based on the following equations. The total volume of juice is 500 mL and a portion of 100 mL is titrated with 0.01 M KIO3(aq) in the acidic condition. The volume of titrant required to reach the end point is 20.00 mL. Calculate the mass of vitamin C in the bottle of juice. (The molecular weight of vitamin C is 176 g/mol.) \( \mathrm{KIO_3} + 5\mathrm{KI} + 6\mathrm{H^+} \longrightarrow 3\mathrm{I_2} + 6\mathrm{K^+} + 3\mathrm{H_2O} \) \( \mathrm{C_6H_8O_6} + \mathrm{I_2} \longrightarrow \mathrm{C_6H_6O_6} + 2\mathrm{I^-} + 2\mathrm{H^+} \) (A) 0.1056 g (B) 0.528 g (C) 0.176 g (D) 0.0352 g (E) None of the above

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