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15 The above is a plot of wavelength vs absorbance for a colored solution as determined bya spectrophotometer. The wavelength of maximum absorption is a. 400nm b. 440nm c. 575nm d. 700nm 22· The prelab for the absorption spectrum!ab contained the following data table 4.0 3.0 2.0 1.0 Volume of 0.273 M NiCh solution (mL) Volume of H20 (mL) Concentration of NiCh (M) Absorbance (A) The concentration of the NiCl2 solution in test tube 2 is 0.0 1.0 2.0 3.0 0.601 0.451 0.300 0.151 a. 0.273M b. 0.205M c. 0.1365M d. 0.091M All of the following observations would be considered evidence of a chemical reaction EXCEPT for a. Precipitation b. dramatic color changes 23. c. gas evolved d. solid dissolves in solventExplanation / Answer
21.The wavelength of maximum absorption is 575 nm.
22. The concentration of NiCl2 solution in test tube is 0.205 M.
23. (a) precipitation reaction.
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