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The different colors

Use Le Chatelier’s principle to explain the different colors found in the following equilibria. (This means your explanation will say either reactant added, reactant removed, product added, product removed.)
Show all chemical reactions.
a.
i. Which way does it shift when Fe3+ is added?
ii. Explain why in terms of LeChatelier’s Principle.
iii. Which way does it shift when SCN- is added?
iv. Explain why in terms of LeChatelier’s Principle.
b.
i. Which way does it shift when NH3 is added?
ii. Explain why in terms of LeChatelier’s Principle.
iii. Which way does it shift when vinegar is added?
iv. Explain why in terms of LeChatelier’s Principle.
c.
The formation of CoCl42- from Co2+ and Cl- is endothermic.
i. Which way does it shift when HCl is added?
ii. Explain why in terms of LeChatelier’s Principle.
iii. Which way does it shift when Ag+ is added?
iv. Explain why in terms of LeChatelier’s Principle.
v. Which way does it shift when it is heated?
vi. Explain why in terms of LeChatelier’s Principle.
vii. Which way does it shift when it is cooled?
viii. Explain why in terms of LeChatelier’s Principle.

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