Table of Contents
Which of the following have 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.
Which ion has least flocculation value?
PO4−3.
Which of the following has minimum flocculation value of positively charged sol?
SO42−.
Which has least flocculation power?
More is coagulating power , lesser is coagulation value .
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.
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.
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 of the following has highest flocculation value?
Fe(OH)3 is positively charged. Hence Cl- ions with minimum opposite charge will have maximum flocculation value (minimum cagulating power).
Which one of the following has maximum value of flocculation power?
Flocculanting power is directly proportional to the fourth power of the valency of the ion.
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.
What is meant by flocculation?
Flocculation is a process by which a chemical coagulant added to the water acts to facilitate bonding between particles, creating larger aggregates which are easier to separate. The method is widely used in water treatment plants and can also be applied to sample processing for monitoring applications.
How can I find gold number?
Gold number: It can be defined as the number of milligrams of the protective colloid required to just prevent the precipitation of 10 cc of a gold sol by the addition of 10% NaCl solution. Gold number is the degree of the minimum amount of lyophilic protective colloid coated (in mg.).
Is soap a sol?
A sol is a combination of a solid that is evenly dispersed throughout a fluid. Since, in Soap dispersion medium is liquid and dispersed phase is gas. And after going through the classification of colloidal solution as written above, we can simply conclude that Soap is an example of Foam.
Which will not form colloidal solution?
Hint: Only gas in gas systems will not form a colloidal state because all gases are miscible due to which they do not form colloids.
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.
Is AS2S3 positively charged?
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.
Which has max value of mean free path?
Which Has the Maximum Value of the Mean Free Path? The molecule possessing a small size will have a maximum mean free path.
Is Congo Red sol a positively charged sol?
Based on the nature of the charge on the colloidal particles, colloidal solutions are classified as positively charged or negatively charged sols. Starch sol, metal sols like copper sol and gold sol, metal sulphide sols and acid dyes like Congo red, are examples of negatively charged sols.
What is flocculant for?
Flocculant refers to the chemical or substance added to a suspension to accelerate the rate of flocculation or to strengthen the flocs formed during flocculation.
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.
How can flocculation be prevented?
When particles of a suspension come close together they can form aggregates called flocculates which will settle more rapidly. To prevent that we often coat the particle with a charged surfactant. The charge (Zeta potential) acts to keep the particles separate and prevent flocculation.
Is gold a sol?
Gold sol being a sol of gold (Au) metal is thus, a lyophobic sol. Metal sols are generally negatively charged. Therefore, gold sol is also a negative charged sol. Macromolecular colloids are formed when macromolecules having large molecular masses are dissolved in a dispersion medium.
Is soap an acid or a base?
Hint :Soap is made up of a weak acid (fatty acids) and a strong base (lye), resulting in what is known as “alkali salt,” or a salt with a basic pH. When you put a pH strip (also known as a litmus test) in soapy water, it usually comes back with an 8 or 9 .
Is soap lather an aerosol?
D) Soap lather is an example of foam. Dispersion medium is liquid and the dispersed phase is gas. Options “B” and “C” are correct. Aerosols are minute particles suspended in the atmosphere.
How do you explain Peptization?
Peptization or deflocculation is the process of converting precipitate into colloid by shaking it with a suitable electrolyte called peptizing agent. This is particularly important in colloid chemistry or for precipitation reactions in an aqueous solution.
What is Peptization Ncert?
Peptization is the process of formation of colloidal sol in which conversion of fresh precipitate into colloidal particles by shaking it with the dispersion medium with the help of a small amount of suitable electrolyte.
Which 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.
Which gas has maximum value of CPM?
Hence, vrms of H2 will be maximum.
Which gas has highest mean free path?
For longest mean tree path, molecular weight should be less. H2=2. N2=28. O2=32. Cl2=71. ∴H2 have longest mean tree path.
Which gas has the longest mean free path?
Hence, H2 is the answer.
