Strategy:

1. Step 1: Calculate the freezing point depression of benzene. T_f = (Freezing point of pure solvent) – (Freezing point of solution) …
2. Step 2 : Calculate the molal concentration of the solution. molality = moles of solute / kg of solvent. …
3. Step 3: Calculate K_f of the solution. T_f = (K_f) (m)

What is Cryoscopy and Ebullioscopy?

The term ebullioscopy comes from the Latin language and means “boiling measurement“. This is related to cryoscopy, which determines the same value from the cryoscopic constant (of freezing point depression). This property of elevation of boiling point is a colligative property.

What does KF in chemistry mean?

Kf is a constant for a given solvent. Kf is called the molal freezing point depression constant and represents how many degrees the freezing point of the solvent will change when 1.00 mole of a nonvolatile nonionizing (nondissociating) solute dissolves in one kilogram of solvent.

Is KF acid or base?

The solution of KF would be basic.

What is KF name?

Potassium fluoride is the chemical compound with the formula KF.

Is cryoscopic constant depends on nature of solute?

Answer: Cryoscopic constant may be defined as the depression in freezing point when one mole of non-volatile solute is dissolved in one kg of solvent. … It depends on the malar mass of the solute in the solution.

Is cryoscopic constant depends on nature of solvent?

Cryoscopic constant depends on number of solvent molecules.

What is Cryoscopic and Ebullioscopic constant?

The key difference between ebullioscopic constant and cryoscopic constant is that ebullioscopic constant is related to the boiling point elevation of a substance whereas cryoscopic constant is related to the freezing point depression of a substance.

What is a cryoscopic constant Shaalaa?

Cryoscopic constant or the Molal depression constant is defined as the depression in freezing point when one mole of non-volaitile solute is dissolved in one kilogram of solvent. Its unit is K.Kg.mol^–1. Concept: Colligative Properties and Determination of Molar Mass – Depression of Freezing Point.

What is Ebullioscopic constant?

Ebullioscopic constant (E_b) is the constant that expresses the amount by which the boiling point T b of a solvent is raised by a non-dissociating solute. Its units are K Kg mol-1. b is the molality of the solute.

What is Cryoscopic point?

: the determination of the lowered freezing points produced in liquid by dissolved substances in order to determine molecular weights of solutes and various properties of solutions.

Which are Colligative properties?

Colligative Properties. Colligative properties of solutions are properties that depend upon the concentration of solute molecules or ions, but not upon the identity of the solute. Colligative properties include vapor pressure lowering, boiling point elevation, freezing point depression, and osmotic pressure.

What is the unit of KF?

Kf is the molal freezing point depression constant of the solvent (1.86 °C/m for water). m = molality = moles of solute per kilogram of solvent. i = the number of dissolved particles (Van’t Hoff Factor).

Is osmosis is a Colligative property?

Osmotic pressure is a ‘colligative’ property, like freezing point depression, which means that it depends on the number of particles in solution but not on their chemical identity.

Does Molal elevation depend on Molality?

Molal elevation constant depends on the nature of the solvent as it is characteristic of solvent. ΔT b =K b ×m. HOPE IT HELPS AND MARK ME THE BRAINLIEST !

Why the value of KF is independent of the nature of solute?

This is because both the molal elevation in boiling point constant i.e. ${K_b}$ and molal depression in freezing point constant i.e. ${K_f}$ are the characteristics of solvent and not the solute. Both ${K_b}$ and ${K_f}$ are independent of the solute.

What is Carrier Scopic constant?

Solution. Cryoscopic constant: Molal depression constant or cryoscopic constant is the depression in the freezing point of a solution containing one mole of the non – volatile solute in one kilogram of solvent.

Which of the following solution will have the highest freezing point?

Hence, the highest freezing point is 0.1 m of NaCl solution.

Which of the following aqueous solution has highest freezing point?

The lowest van’t hoff factor will result in the least depression in freezing point and hence that solution will have the highest freezing point. Hence, the correct option is D, glucose.

Will KF dissolve in water?

Is potassium fluoride a liquid? Potassium fluoride is the chemical compound with formula KF . KF is a crystalline powder with m.w. of 58.10, melting piont of 858℃, boiling point of 1505℃ and density of 2.481 g/cm3. KF is insolube in alcohol but have a good solubility in water.

What is KF used for?

Applications in organic chemistry

In organic chemistry, KF can be used for the conversion of chlorocarbons into fluorocarbons, via the Finkelstein (alkyl halides) and Halex reactions (aryl chlorides). Such reactions usually employ polar solvents such as dimethyl formamide, ethylene glycol, and dimethyl sulfoxide.

Is ch3nh3cl an acid or base?

Due to the reactivity of this methylammonium cation, the solution of this salt compound will be acidic (pH below 7).

Cryoscopic constant may be defined as the depression in freezing point when one mole of non-volatile solute is dissolved in one kg of solvent. It may also be defined as the molal depreesion constant . Its unit is k.kg.mol−1.

What is cryoscopic constant shaala?

Cryoscopic constant is the depression in freezing point produced by 1 molal solution of a nonvolatile solute.

What is significance of cryoscopic constant?

Through cryoscopy, a known constant can be used to calculate an unknown molar mass. The term “cryoscopy” comes from Greek and means “freezing measurement.” Freezing point depression is a colligative property, so ΔT depends only on the number of solute particles dissolved, not the nature of those particles.

Is cryoscopic constant depends on nature of solute?

Its unit is K. Kg. mol−1 . Hence, the cryoscopic constant value depends upon the molar mass of the solute in the solution.

What is the meaning of Cryoscopic?

a technique for determining the molecular weight of a substance by dissolving it and measuring the freezing point of the solution. … the determination of the freezing points of certain bodily fluids, as urine, for diagnosis.

What is Ebullioscopic constant?

Ebullioscopic constant (E_b) is the constant that expresses the amount by which the boiling point T b of a solvent is raised by a non-dissociating solute. Its units are K Kg mol-1. b is the molality of the solute.

What are the conditions for abnormal Behaviour of solute?

The abnormal behaviour of colligative properties has been explained in terms of dissociation and association of solute molecules. Such solutes which dissociate in solvent (water) i.e. electrolytes, show an increase in number of particles present in solution.

Which are Colligative properties?

Colligative Properties. Colligative properties of solutions are properties that depend upon the concentration of solute molecules or ions, but not upon the identity of the solute. Colligative properties include vapor pressure lowering, boiling point elevation, freezing point depression, and osmotic pressure.

What is a Cryoscopic constant very short answer?

Cryoscopic constant : It is the depression of freezing point of the solvent produced on dissolving one mole of a substance in 1000 g of it. It is also called molal depression constant.

What is the unit of KF?

Kf is the molal freezing point depression constant of the solvent (1.86 °C/m for water). m = molality = moles of solute per kilogram of solvent. i = the number of dissolved particles (Van’t Hoff Factor).

Why osmotic pressure is a Colligative property?

Solutions. … colligative property depend on the number of solute particles irrespective of their nature relative to the total number of particles present in the solution. Osmotic pressure depends upon the number of particles of solute, i.e., molarity of solute. Therefore, it is considered as colligative property.

How do you find the Cryoscopic constant?

Strategy:

1. Step 1: Calculate the freezing point depression of benzene. T_f = (Freezing point of pure solvent) – (Freezing point of solution) …
2. Step 2 : Calculate the molal concentration of the solution. molality = moles of solute / kg of solvent. …
3. Step 3: Calculate K_f of the solution. T_f = (K_f) (m)

What is the value of KF?

The value of Kf for water is 1.86^o , calculated from glucose solution.

What is the reason for abnormal Colligative property?

When the dissolved solute undergoes a molecular change like dissociation or association in the solution, it causes abnormal colligative properties.

What are abnormal colligative properties?

Answer: Abnormal colligative property: When the experimentally measured colligative property of a solution is different from that calculated theoretically by the van’t Hoff equation or by the laws of osmosis, then the solution is said to have abnormal colligative property.

What is an abnormal molecular weight?

In chemistry, when the molar masses are calculated and if they are higher or lower than the expected value are known as abnormal molar masses. These are calculated using the colligative properties.

What is the formula of ebullioscopic constant?

R is the ideal gas constant. T_b is boiling point of the solvent. M is the molar mass of the solvent. ΔH_vap is the molar enthalpy of vaporization.

What is Ebullioscopic method?

An ebullioscope (from the Latin ēbullīre (to boil) + -scope) is an instrument for measuring the boiling point of a liquid. … The procedure is known as ebullioscopy. The first ebullioscope was invented in 1838 by Honoré Brossard-Vidal, and was used for measuring alcoholic content.

What is Cryoscopic and ebullioscopic constant?

The key difference between ebullioscopic constant and cryoscopic constant is that ebullioscopic constant is related to the boiling point elevation of a substance whereas cryoscopic constant is related to the freezing point depression of a substance.

What is Cryoscopic effect?

The reduction in the freezing point of solvents due to the addition of solutes e.g. salt added to water.

What is a Cryoscopic osmometer?

Cryoscopic osmometer (Ψ_s measurement)

The cryoscopic osmometer measures the osmotic potential of a solution by measuring its freezing point. Solutions have colligative properties that collectively depend on the number of dissolved particles and not on the nature of the solute.

What is freezing point of a solution?

The freezing point is the temperature at which the liquid solvent and solid solvent are at equilibrium, so that their vapour pressures are equal. When a non-volatile solute is added to a volatile liquid solvent, the solution vapour pressure will be lower than that of the pure solvent.

Is osmosis is a Colligative property?

Osmotic pressure is a ‘colligative’ property, like freezing point depression, which means that it depends on the number of particles in solution but not on their chemical identity.