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Fe(OH)3 is positively charged. Hence Cl- ions with minimum opposite charge will have maximum flocculation value (minimum cagulating power).
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.
Which ion has maximum precipitation flocculation value?
CO3−2.
Which of the following electrolyte will have maximum flocculation value?
To coagulate Fe(OH)3 -ve charged electrolyte is used and greater the value of -ve charge ,coagulating power will be strong . Among the given electrolytes , NaCl has lowest coagulating power . So , its flocculation value will be maximum .
Which has more flocculation power?
Coagulation destabilizes the particles while flocculation carries the particles away from the water. It means that the flocculating power is more for an ion having greater valency. More the valency of an ion more is the power of the ion to cause precipitation of the colloids. This is called Hardy-Schulze rule.
What is hardy 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.
How do you calculate 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 ion has highest precipitating power?
Coagulating power of an electrolyte is directly proportional to the valency of the active ions. As2S3 is a negative sol hence AlCl3 has maximum precipitating power for this.
Which ion has highest precipitation power?
Negatively charged As2S3 sol coaulated most effectively by AlCl3. This is because oppositely charged Al+++ ions have maximum charge.
Which ion has least flocculation value for a positive solution?
PO4−3.
Which ion has maximum flocculation value for a positive sol?
Fe(OH)3 is positively charged. Hence Cl- ions with minimum opposite charge will have maximum flocculation value (minimum cagulating power).
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.
Which has maximum flocculation value for positive sol?
Maximum flocculation value will be for the electrolyte having minimum coagulating power. Hence, NaCl having lowest charge will have minimum coagulation power and hence, maximum flocculation value.
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.
Which is not a colloidal solution?
Air is not a colloidal solution because it is a homogeneous mixture.
Which is not a method of purification of colloidal solution?
Colloidal solutions are not purified by electrophoresis. Movement of colloidal particles under the influence of electric field is called electrophoresis. So, it can make easier. Electrophoresis is the property of colloids not the purification method.
What is hardy Schulze rule Explain with examples?
The coagulating or flocculate capacity of an electrolyte increases with increase in charge is known as Hardy – Schulze law. Example 1: To coagulate a negative sol, the coagulating capacity of positive ion is Al+3 > Mg+2 > Na+ Example 2: To coagulate a positive sol the coagulating capacitor of negative ion.
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.
What is the main cause of charge on a colloidal solution?
The origin of the charge on the sol particles in most cases is due to the preferential adsorption of either positive or negative ions on their surface. The charge on the colloidal particles is balanced by the oppositely charged ions in the sol.
Which has minimum flocculation value?
The minimum concentration of an electrolyte required to cause coagulation of a sol is called its flocculation value. It is expressed in millimoles per litre. If the flocculation value of MgSO4 for standard As2S3 sol is 3.33.
How is gold number calculated?
Gold number is calculated by know the number of milligrams of protective colloid which is sufficient to prevent the coagulation of 10 ml of standard gold solution when 1 ml of 10% solution of sodium chloride is added to it.
What is gold number in surface chemistry?
The Gold Number is the minimum weight (in milligrams) of a protective colloid required to prevent the coagulation of 10 ml of a standard hydro gold sol when 1 ml of a 10% sodium chloride solution is added to it. It was first used by Richard Adolf Zsigmondy.
Why is arsenic sulphide negatively charged sol?
> Let’s look at the answer: – The arsenious sulphide sol given in the question carries a negative charge on it. > “According to Hardy-Schulze rule, the greater the valency of the flocculating ion (ion carrying opposite charge to the sol) the greater will be its coagulating power.”.
Which one has highest coagulation power for AS2S3?
Since, AS2S3 is a negatively charged sol, the ion bearing the highest positive charge, is more effective for its coagulation. Al3+ has the highest positive charge, ie, +3, so it is more effective for the coagulation of AS2S3 sol.
What is the charge on AS2S3 sol?
The colloidal particles in As2S3 sol are having a negative charge. When NaCl electrolyte is added, Na+ ions in the electrolyte neutralises the negative charge on the colloidal particles. Hence Na+ ion is the coagulating ion.
Which one has highest coagulation power?
Which one has the highest coagulation power? Solution: According to the Hardy Schulze rule, greater the valency of an effecting ion greater will be its coagulation power. As Sn4+have greater valency then Sn4+have highest coagulation power.
What is the process of Peptization?
Peptization or deflocculation is the process of converting precipitate into colloid by shaking it with a suitable electrolyte called peptizing agent. The electrical repulsion no longer hinders the aggregation of particles and they can then coalesce to form a flocculent precipitate that is easy to filter.
Is As2S3 negatively charged?
As2S3 is Negatively Charged particles Solution, and it will attract Al3+ from Aluminium Nitrate. The Stability of the mixture State is because of the Existence of similar charges on the particles.
