Test-exam 2

H a ha k 1 25 103 4 40 10 therefore before reaction

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Unformatted text preview: 250 0.300 75.0 After reaction, 5 mmolH 0 mmolHA 38.8 mmol A 75.0 38.8 6 9. The following table is given in the lab manual and the graph is obtained by one of the students when doing the Buffers and Indicators experiment. Flask 1 2 3 4 5 6 7 8 Instructions Mix 48-mL of 0.10 M HCl with 2-mL of bcg. Mix 48-mL of 0.10 M HAc with 2-mL indicator Make 48-mL of pH = 3.7 solution using 0.10 M HAc and 0.20 M NaAc. Make 48-mL of pH = 4.0 solution using the 0.10 M HAc and the 0.20 M NaAc. Make 48-mL of pH = 4.8 solution using 0.10 M HAc and 0.10 M NaOH. Make 48-mL of pH = 5.4 solution using 0.10 M HCl and 0.20 M NaAc. Make 48-mL of pH = 5.8 solution using 0.10 M HAc acid and 0.20 M NaAc. Mix 48-mL of 0.20 M NaAc with 2-mL bcg BCG Spectra 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 400 1.4 1.2 1 0.8 0.6 0.4 0.2 0 450 500 550 600 650 700 750 Flask 1 Absorbance Flask 8 Absorbance Flask 1 Flask 8 Wavelength, nm Based on the above table and graph, which of the following statements is CORRECT? a. The student should select 440nm and 625nm as the two maximum wavelengths, max , for subsequent studies.* b. The graph indicate...
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