What are the application of adsorption in chemical analysis ?
(i) In dying
Many dyes adsorbed on the cloth either directly or by the use of mordents
(ii) For the removal of colouring and adsorbing matter
Activated charcoal is used for removing colouring matter from solutions of sugar and other organic liquids such as oils etc. Fuller’s earth can also be used for removing undesirable colouring/adsorbing matter from liquids/solutions.
(iii) For recovery from industrial wastes/mixtures
Components of mixtures may be separated making use of the differences in the adsorption power of the various components of any mixture.
(iv) For softening of water
Hard water can be softened by using ion exchange resins. The use of these Ion-exchange resins is based on selective adsorption from solutions.
(v) Chromatographic analysis
The chromatographic technique is based on the principle of adsorption. This technique is used for the identification/separation of various components of a mixture/solution.
(vi) Use of adsorption indicators
Many dyes such as fluorescein, can be used as adsorption indicator in silver nitrate precipitation titrations. At the completion of the titration, the ions produced by the dye in the solution get adsorbed onto precipitates of silver halide, and undergo a colour change.
Many dyes adsorbed on the cloth either directly or by the use of mordents
(ii) For the removal of colouring and adsorbing matter
Activated charcoal is used for removing colouring matter from solutions of sugar and other organic liquids such as oils etc. Fuller’s earth can also be used for removing undesirable colouring/adsorbing matter from liquids/solutions.
(iii) For recovery from industrial wastes/mixtures
Components of mixtures may be separated making use of the differences in the adsorption power of the various components of any mixture.
(iv) For softening of water
Hard water can be softened by using ion exchange resins. The use of these Ion-exchange resins is based on selective adsorption from solutions.
(v) Chromatographic analysis
The chromatographic technique is based on the principle of adsorption. This technique is used for the identification/separation of various components of a mixture/solution.
(vi) Use of adsorption indicators
Many dyes such as fluorescein, can be used as adsorption indicator in silver nitrate precipitation titrations. At the completion of the titration, the ions produced by the dye in the solution get adsorbed onto precipitates of silver halide, and undergo a colour change.