CHM 3120 UF Exam 1 100% Verified

points. 1. In Analytical Chemistry, we often use calibration curves. Which of the following statements is false concerning calibration curves? (A) Calibration curves permit the analysis of unknowns by comparison with standards (B) The slope of a calibration curve is a measure of a method’s detection limit. (C) Non-zero y-intercepts arise from blank contributions. (D)Straight line calibration curves are desirable but not required 2. A city’s water supply is fluoridated by adding NaF. The desired concentration of Fis 1.6 ppm. How many milligrams of NaF should be added per gallon treated water if the water already is 0.2 ppm in F- . (1gallon = 3.78 liters) (A) 50 mg (B) 5.3 mg (C) 11.7 mg (D) 18 mg (E) other 3. The concentration of copper in a drinking water sample was found to be 1.3 x 10-8 M. Express the concentration in ppb. (A) 3.3 ppb (B) 11 ppb (C) 7.7 ppb (D) 0.84 ppb (E) other