1.

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

Answer»

`AGI//Ag^(+):I^(-1)`
`AgI//K^(+) : NO_(3)^(-)`
`AgI//NO_(3)^(-) : Ag^(+)`
`AgI//I^(-) : K^(+)`

Solution :As EXCESS of KI has been ADDED, `I^(-)` ions are adsorbed on AgI forming a FIXED layer (and giving it a negative charge). It then attracts the counter ions `(K^(+))` from the MEDIUM forming a second layer (diffused layer).


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