What is the reason for preferential adsorption?
Table of Contents
- 1 What is the reason for preferential adsorption?
- 2 What do you mean by preferential adsorption?
- 3 Which is positively charged sol in preferential adsorption?
- 4 Why does precipitation occur in precipitation titration?
- 5 Which is positively charged Sol in preferential adsorption?
- 6 How does an equal and similar charge gives stability to the colloidal solution?
- 7 What is the role of ion adsorption in soil?
- 8 How does pH affect metal adsorption in soil?
What is the reason for preferential adsorption?
A colloidal particle usually adsorbs those ions which are in excess and are common to its own lattice. This preferential adsorption of a particular type of ions imparts a particular type of charge to colloidal particles.
How can adsorption indicator be used in precipitation titration?
A type of indicator used in reactions that involve precipitation. As long as Cl− ions are in excess, they adsorb on the precipitate particles. At the end point, no Cl− ions are left in solution and negative fluorescein ions are then adsorbed, giving a pink colour to the precipitate.
What do you mean by preferential adsorption?
What is the basic importance of presence of a charge on colloidal particle?
Importance of Charge on Colloidal Particles: In the case of lyophobic sols, charge on colloidal particles is fully responsible for its stability. In the case of a lyophilic sol, the stability is due to the charge on colloidal particles and solvation.
Which is positively charged sol in preferential adsorption?
Charge on the colloidal particles is due to the preferential adsorption of Kl adsorbs negative Iɵ ions and hence is negatively charged. However, on shaking AgI with excess of AgNO3 solution, it will adsorb Ag⊕ ions and hence becomes positively charged.
What is electro osmosis Class 12?
The movement of colloidal particles under the influence of an electric field is called electrophoresis. When the movement of particles is prevented, it is observed that the dispersion medium starts to move in the electric field. This is called electroosmosis.
Why does precipitation occur in precipitation titration?
Precipitation titration is a type of titration which involves the formation of precipitate during the titration technique. In precipitation titration, the titrant reacts with analyte and forms an insoluble substance called precipitate. It continues till the last amount of analyte is consumed.
Which precipitation takes place after completion of main precipitation?
Precipitation size and speed
| Intensity inches/hour (cm/hour) | Median diameter (millimeters) | |
|---|---|---|
| Fog | 0.005 (0.013) | 0.01 |
| Mist | .002 (0.005) | .1 |
| Drizzle | .01 (0.025) | .96 |
| Light rain | .04 (0.10) | 1.24 |
Which is positively charged Sol in preferential adsorption?
How does zeta potential work?
The magnitude of the zeta potential indicates the degree of electrostatic repulsion between adjacent, similarly charged particles in a dispersion. For molecules and particles that are small enough, a high zeta potential will confer stability, i.e., the solution or dispersion will resist aggregation.
How does an equal and similar charge gives stability to the colloidal solution?
Answer: (b, d) Presence of equal and similar charges on colloidal particles provides stability to colloids as repulsive forces between charges particles having same charge prevent them from colliding when they come closer to each other.
What is the cause of stability of colloidal solution?
The stability of a colloidal system is defined by the particles which remain suspended at equilibrium in the solution. Stability is hampered by dynamics of accumulation and sedimentation that are driven by the inclination of the colloid to decrease surface energy. The colloid’s stability is only due to these charges.
What is the role of ion adsorption in soil?
Adsorption of ions Ion adsorption and subsequent exchange are important processes that take place between soil colloidal particles (clays, organic matter, sesquioxides, and amorphous minerals) and various ions. Soil colloids serve very much as a modern bank.
Why do colloidal particles adsorb ions from solutions?
Due to preferential adsorption of ions from solutions: The colloidal particles have a tendency to preferentially adsorb a particular type of ions from the solution. A colloidal particle usually adsorbs those ions which are in excess and are common to its own lattice.
How does pH affect metal adsorption in soil?
Soil contains a variety of hydrous oxide minerals and organic matter. Those substances possess surface hydroxyl groups whose protons can be donated to the surrounding solution and can take up metal ions in return. Therefore, adsorption of metal ions onto these sites is a function of pH.
What is the effect of intermolecular attraction on adsorption?
As the effect of intermolecular attraction is weak, the structure of the adsorbate molecules hardly changes, the adsorption energy is small, and the adsorbed substance is easily separated again. The adsorption due to the action of chemical bonds is chemical adsorption.