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Chemistry Question on Surface Chemistry

When an excess and a very dilute aqueous solution of KIKI is added to a very dilute aqueous solution of silver nitrate, the colloidal particles of silver iodide are associated with the Helmholtz double layer

A

AgI:Ag+:NO3−AgI : Ag^{+} : NO_{3}^{-}

B

AgI:K+:NO3−AgI: K^{+} : NO_{3}^{-}

C

AgI:NO3−:Ag+AgI : NO_{3}^{-} : Ag^{+}

D

AgI:I−:K+AgI : I^{-} : K^{+}

Answer

AgI:I−:K+AgI : I^{-} : K^{+}

Explanation

Solution

The Helmholtz double layer contains a layer of opposite charges on the surface of colloidal particles.
AgNO3+KIexcess →AgI+KNO3AgNO_{3}+\underset{\text{excess}}{KI}\,\rightarrow AgI+KNO_{3}
AgI+KI→AgI:I−:K+AgI+KI\rightarrow AgI : I^{-} : K^{+}