To calculate the freezing point depression constant, or Kf, you"ll need the equation: delta Tf = Kfcm where cm is the molal concentration of the solution. Write down what you know. Since Kf is a constant, or a number that is always the same, it is often provided in a chart or table in chemistry books.

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Correspondingly, what is the 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.

Similarly, what is the KF value of camphor? Camphor has a particularly large freezing point depression (Kf) constant of 40 C/m. Camphor"s Kf value is over 20 times larger than water"s Kf value. Camphor has a freezing point of 176 Celsius.

In respect to this, what is the KF of ethanol?

Chemistry. The freezing point of ethanol is -114.6 C and its Kf value is 2.00 C/m. I ended up the answer of -118.4 C but the answer is apparently -120.

Is KF an acid or base?

KF is a salt that comes from a strong base, KOH, and a weak acid, HF. When added to water, the salt dissociates into a K+ ion and F- ion. The F- ion, which is the conjugate base of the weak acid, reacts with water by accepting one hydrogen atom from water and forming hydroxide.


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Why Methanol is used in KF titration?


Karl Fischer discovered that this reaction could be modified to be used for the determination of water in a non-aqueous system containing an excess of sulfur dioxide. He used a primary alcohol (methanol) as the solvent, and a base (pyridine) as the buffering agent.

Is KF aqueous?


Potassium fluoride solution is used for pH adjustment in industrial textile processing facilities or laundries. It is also an intermediate or raw material used in other chemical synthesis or processes, most often for agrichemical or pesticide products. Potassium fluoride is sold in an aqueous (water) solution.

What is KF solubility?


Would the solubility of the salt increase or decrease? Many metal sulfides are insoluble in water, but dissolve in acidic solutions. Complex Ion Formation, or stability constant, Kf, of a complex ion is the equilibrium constant for the formation of the complex ion from the aqueous metal ion and the ligands.

What is the KF of glucose?


Calculate the freezing point: the freezing point of the solution: 50.0 g of glucose, C6H12O6, added to 118 g of water (Kf=1.86°C)

What is K sub F in chemistry?


i = van "t Hoff factor. Kf = molal freezing point depression constant or cryoscopic constant in °C kg/mol. m = molality of the solute in mol solute/kg solvent.

What is KF reaction?


The Karl Fischer Titration is a titration method for measuring water content in basically all types of substances. It was invented in 1935 by the German chemist Karl Fischer. The Karl Fischer Titration is based on an iodine / iodid reaction: The water reacts with iodine.

Why is disodium tartrate dihydrate used for KF?


Sodium tartrate dihydrate is the volumetric standard for Karl Fischer titration. Under normal conditions, it is stable and non-hygroscopic. Sodium tartrate dihydrate has a stoichiometric water content of 15.66% and is primarily used for titer determination in volumetry.

What is KF of NaCl?


The freezing point depression constant (Kf) for water is 1.86°C/m where m is the molality of the solution. NaCl has a van"t Hoff factor of 2 (i = 2).

What is the kb for NaCl?


What is the boiling point of 1 molal aqueous solution of NaCl (Kb =0.52k molal^-1)?

What is the kb value of water?


List of boiling and freezing information of solvents
Solvent Boiling point (°C) Kb (°C/mol/kg)
Naphthalene 217.9
Nitrobenzene 210.8 5.24
Phenol 181.75 3.60
Water 100.00 0.512

How do you calculate Molality?


Just multiply the number of grams, x, by 1 kilogram over 1,000 grams. Sometimes, we are given the number of grams of solute. Molality is the moles of solute per kilogram of solvent. To convert the number of grams of solute to moles of solute, we follow the equation: moles of solute = mass of solute / molar mass solute.

What is Colligative property in chemistry?


In chemistry, colligative properties are those properties of solutions that depend on the ratio of the number of solute particles to the number of solvent molecules in a solution, and not on the nature of the chemical species present. The word colligative is derived from the Latin colligatus meaning bound together.

What is boiling point and freezing point?


Boiling point elevation is the raising of a solvent"s boiling point due to the addition of a solute. Similarly, freezing point depression is the lowering of a solvent"s freezing point due to the addition of a solute. In fact, as the boiling point of a solvent increases, its freezing point decreases.

What can be used as a solvent?


Common uses for organic solvents are in dry cleaning (e.g. tetrachloroethylene), as paint thinners (e.g. toluene, turpentine), as nail polish removers and glue solvents (acetone, methyl acetate, ethyl acetate), in spot removers (e.g. hexane, petrol ether), in detergents (citrus terpenes) and in perfumes (ethanol).

What has the highest freezing point?


In the absence of nucleators water can exist as a supercooled liquid down to −48.3 °C (−55 °F, 224.8 K) before freezing. The chemical element with the highest melting point is tungsten, at 3,414 °C (6,177 °F; 3,687 K); this property makes tungsten excellent for use as filaments in light bulbs.

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What is the KF of stearic acid?


the mixture (stearic acid containing unidentified fatty acid) is the freezing point depression, ΔTf. Given that the freezing point depression constant (Kf) for stearic acid is. 4.5 oC/kg/mole and the following equation: ∆Tf = Kfm, where m = molality of solvent.

What is the value of KF for cyclohexane?


20.0 °C
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