Having a horrible time with my post lab! I need help with parts B,C, and D. Part

Question

Having a horrible time with my post lab! I need help with parts B,C, and D.

Part A - When I added NaOH It turned the precipitate from yellow to white. Once HCl was added it changed back to yellow

Part B - When AgNO3 was added the precipatate formed and solution turned clear from orange. When NaCl was added it turned back to orange.

Part C - Initial color was purple. When H2O was added it turned pink. With a hot bath it turned back purple. With a ice bath it went back to pink.

Part D - Mixed bromothymol blue turned from green to orange when HCl was added. With NaOH added it turned green. More NaOH turned it blue.

Attached are the proceedure and questions.

Explanation / Answer

PART B

a)

Fe+3 and SCN- will form Fe(SCN)+2 complex, which is red/balckish red bolor similar to blood due to the electron config established by the central atom, Fe+3

b)

AgNO3, will precipitate AgSCN, it is also red/brown color, precipitate (solid!)

c)

enough Cl- until:

Ag+ + Cl- --> AgCl (s)

this is a whit salt

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