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

Question

When an excess and a very dilute aqueous solution of KI 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-  (B)  AgI: K+: NO3-  (C)  AgI: NO3-: Ag+  (D)  AgI: I-: K+

Tardigrade Admin · Accepted Answer

The Helmholtz double layer contains a layer of opposite charges on the surface of colloidal particles. AgNO3+ underset textexcessKI arrow AgI+KNO3 AgI+KIarrow AgI: I-: K+

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

$A g I : A g^{+} : N O_{3}^{-}$

$A g I : K^{+} : N O_{3}^{-}$

$A g I : N O_{3}^{-} : A g^{+}$

$A g I : I^{-} : K^{+}$

The Helmholtz double layer contains a layer of opposite charges on the surface of colloidal particles.
$A g N O_{3} + excess K I \to A g I + K N O_{3}$
$A g I + K I \to A g I : I^{-} : K^{+}$

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

AgI:Ag+:NO3−​

AgI:K+:NO3−​

AgI:NO3−​:Ag+

AgI:I−:K+