Samuel F. answered • 02/29/20
Tutor
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Chemical Engineer with 5+ Years of Tutoring Experience
Hello!
It would be better if you've described what you saw on class. Like how you calculated the Ni2+, the Part III of your problem. But I'll try my best.
When you add HCl, it reacts with the NH3, therefore you break the complex, so you'll have a different result in the spectrophotometer and will see changes in color.
Due to the Beer-Lambert Law, when you decrease the wavelength, you increase the absorbancy (everything else equal) and so decreases the %T.
I hope it helps!
