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Explanation of what happens when you add Ag to FeNCS2+

Explanation of what happens when you add Ag to FeNCS2+

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Answer #1

When Ag+ ions are added to the red FeSCN2+ ions, the colour disappears and a white precipitate og AgSCN forms.

Because the Fe+3 constantly reacts with the available SCN- in solution to form the red complex ion FeSCN+2

Fe+3(aq) + SCN-(aq) --> FeSCN+2(aq)

as soon as the SCN- is all gone then no more FeSCN+2 will form and the red color ofFeSCN+2 will disappear and that will be the endpoint.

As the reaction proceeds the Fe+3 will be regenerated by reacting with the Ag+

Ag+(aq) + FeSCN+2 --> AgSCN(s) + Fe+3(aq)

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