InterviewSolution
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InterviewSolution
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A colloidal solution of Agl is prepared by two different methods shown below: (i) What is the charge of Agl colloidal particles in the two testtubes (A) and (B)? (ii) Give reasons for the origin of charge. |
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Answer» Solution :(i) When `AgNO_3` is added to KI solution , the ppt. of AgI will adsorb `I^(-)` ions from the dispersion medium. THUS, the colloidal particles of AgI will acquire negative charge. When KI is added to `AgNO_3` solution , the ppt. of AgI will adsorb `Ag^(+)` ions. Thus , colloidal particles of AgI will acquire positive charge. (II) Origin of charge can be explained in terms of ADSORPTION of ions from the dispersion medium and with the help of Helmholtz electrical DOUBLE LAYER. 
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