[cu(nh3)4]2+ solutions exhibit a deep blue-violet color. how can you use spectrophotometry to confirm that this reaction has occurred and that the product formed is tetraamminecopper (ii) sulfate?

Analyzing the wavelength of maximum absorbance

Explanation:

Using spectrophotometry during the course of the reaction can confirm that the reaction took place.

The complex [Cu(NH₃)₄]²⁺ has a characteristic wavelength of maximum absorbance ( ), which can be looked up in literature. This characteristic λmax is different from the characteristic λmax of the reagents, as [Cu(NH₃)₄]²⁺ absorbs red-orange light and thus appears with a deep blue-violet color.

answer by yourhope:

how do models compare to real-world objects?

d. most models represent a real-world object in a simpler way.

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the answer is:  

line graphs show patterns in data with variables that change over time; whereas, circle graphs show data as parts out of a whole (such as out of 100%).