Question

&. The concentration of nickel was determined through a spectroscopic method. A 1.0 mL portion of stream water was mixed with 5.0 mL of a chromophore and diluted to 10.0 mL. This solution gave an absorbance reading of 0.0142. Using the calibration curve below, determine the amount of nickel in the stream water. y = 0.0786x + 0.0008 R = 0.9998 0.12 Absorbance -0.020 0.5 1 1.5 2 2.5 Concentration of nickel /mgl a) 0.17 mg/L b) 1.7 mg/L c) 3.4 mg/L d) 0.34 mg/L

Answer 1

Amount of nickel :- Y=0.0786x + 0.0008 >> 0.0142 -0.0786% +0.0008 0.0142 -0.2008 mg 0.07 86 - 0.18048 346 mg/L - O. 17 mg/L x = concentration of diluted solution - 0.17 ng IL Amount of nickel in stream water = 0.18 X 10.0 = 1.7 mg/L Cortion - b