Table of Contents
> Hardy Schulze rule states that the amount of electrolyte required for the coagulation of a definite amount of a colloidal solution is dependent on the valency of the coagulating ion. Coagulating ion is the ion which has the charge opposite to the charge of the colloidal particles).
What is hardy Schulze rule give an example?
– Because the charge on the aluminium +3 is very high when compared to the other ions mentioned. – This process of explanation of the coagulating capacity of an electrolyte is called hardy schulze rule. – Another example for hardy Schulze rule is to coagulate the positive sol there is a need of a negative electrolyte.
Who gave law of coagulation?
Burton and Bishop (1920) have stated a rule attempting to establish a relationship between concentration of a hydro phobe and the coagulation value of electrolytes as follows: 1.
What is modification in Hardy Schulze law?
Thus, Hardy-Schulze law can be modified in terms of the polarising power of the flocculating ion. Thus, the modified Hardy-Schulze law can be stated as ‘the greater the polarising power of the flocculating ion added, the greater is its power to cause precipitation. ‘.
Which law explains the flocculating power of ions?
According to Hardy schulze law the flocculating power of an ion increases witha decrease in sizeb increase in sizec decrease in charged increase in charge.
What is flocculation value?
Flocculation value is defined as the minimum concentration required of an electrolyte to cause the coagulation or flocculation of a solution. Flocculation value is inversely proportional to the coagulating power of the ion.
What is flocculating ion?
Coagulation or precipitation:-it is a process of aggregating together the colloidal particle so as to change them into large sized particles which ultimately settles as a precipitate. The ion which is responsible for neutralization of charge on the colloidal particles is called the coagulating ion or Flocculating ion.
What is Schulze rule?
> Hardy Schulze rule states that the amount of electrolyte required for the coagulation of a definite amount of a colloidal solution is dependent on the valency of the coagulating ion. Hardy and Schulze observed that greater the valency of the flocculating ion or coagulating ion, the greater is its power to coagulate.
What coagulation means?
Coagulation: In medicine, the clotting of blood. The process by which the blood clots to form solid masses, or clots. More than 30 types of cells and substances in blood affect clotting. The process is initiated by blood platelets. The blood cells and plasma are enmeshed in the network of fibrils to form the clot.
What is the coagulation process?
Coagulation, in physiology, the process by which a blood clot is formed. The formation of a clot is often referred to as secondary hemostasis, because it forms the second stage in the process of arresting the loss of blood from a ruptured vessel.
What is flocculating power?
Hint: Flocculating value or the coagulating value is the amount of the electrolyte which is needed so that 1 litre of colloidal solution precipitates easily. The coagulating power or flocculating power is the reciprocal of coagulating value or flocculating value.
Why is the coagulating power of phosphate?
On the basis of Hardy-schuize rule explain why the coagulating power of phosphate is higher than chloride? Answer: Phosphate ion bear – 3 charge while chloride ion carries only -1 charge and due to high charge phosphate ion has. high coagulating power than that of chloride ion.
What is coagulation power?
The powerful particles of the electrolyte in achieving coagulation are those which convey charge inverse to that of the colloidal particles. These particles are called coagulating particles. So, according to this rule, greater the charge on an oppositely charged ion, greater is its coagulation power.
What is the formula for flocculation value?
Complete step by step solution: “The minimum concentration of an electrolyte that is required to cause the coagulation or flocculation of a sol is known as flocculation value.” It is expressed in terms of millimoles per litre. 2 mL of 1 M NaCl contains 2 / 1000 mol = 2 millimole.
Which has maximum flocculation value?
Lower the coagulation value, more efficient is the electrolyte in causing coagulation of sol. We can say coagulation value is inversely proportional flocculation value. having lowest charge will have minimum power and hence have maximum flocculation value. Thus, the correct option is C.
What is Peptization give an example?
Peptization is the method of producing stable colloids using an electrolyte to split up and distribute a precipitate into the colloids. Example: When the ferric chloride is added to the precipitate of ferric hydroxide, the hydroxide precipitate transfer to the sol by absorbing ferric ions.
What is the difference between flocculant and coagulant?
Coagulation is a chemical process. Flocculation is a physical process. Coagulants such as inorganic salts of aluminum or iron that neutralize the suspended particles are added during coagulation. Flocculant such as an organic polymer that involves in bridging and strengthening the flocs is added.
What is an example of flocculation?
Flocculation and coagulation treatment chemicals are used in effluent wastewater water treatment processes for solids removal, water clarification, lime softening, sludge thickening, and solids dewatering. Examples of ChemTreat coagulation products include aluminum salts, iron salts, and polyelectrolytes.
What can be used as a flocculant?
The following natural products are used as flocculants: Chitosan. Isinglass. Moringa oleifera seeds (Horseradish Tree) Gelatin. Strychnos potatorum seeds (Nirmali nut tree) Guar gum. Alginates (brown seaweed extracts).
What is Tyndall effect?
Tyndall effect, also called Tyndall phenomenon, scattering of a beam of light by a medium containing small suspended particles—e.g., smoke or dust in a room, which makes visible a light beam entering a window. The effect is named for the 19th-century British physicist John Tyndall, who first studied it extensively.
Why are colloidal solutions Coloured?
Larger particles absorb the light of longer wavelength and therefore transmit light of shorter wavelength. The colour of a colloidal solution depends upon the size of colloidal particles present in it. Larger particles absorb the light of longer wavelength and therefore transmit light of shorter wavelength.
What happens when dialysis is prolonged?
Due to this removal of electrolytes, the colloidal particles become unstable and will lead to the process of coagulation. Note:Coagulation is a process in which the molecules of the colloidal solution combine to form molecules having a larger size.
