Kf equation

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.

What is KF of NaCl?

Kf is the molal freezing point depression constant for the solvent, and. m is the molality of the solution. Step 1: Calculate the molality of the NaCl. moles of NaCl=31.65g NaCl ×1mol NaCl58.44g NaCl =0.5416 mol NaCl.

What is the KF of glucose?

Kf=1.86∘C⋅kgmol is the freezing point depression constant of water. mi is the molality, mol solutekg solvent , of the solute glucose in the solvent water.

What is the KF of camphor?

The freezing point of camphor is 178.4 C and its molar freezing point depression constant (Kf) is 37.7 C kg/mol.

Is KF acid or base?

KF is a salt of a strong base (KOH) and a weak acid (HF).

What is KF solubility?

Solubility in water. anhydrous: 92 g/100 mL (18 °C) 102 g/100 mL (25 °C) dihydrate: 349.3 g/100 mL (18 °C)

Is KF soluble in water?

KF is highly soluble in water. It initially dissociates into K+ and F-.

How do you calculate delta TB?

512 Degree C/molality Bp Solution = 97.2 Degree C Calculate Delta Tb Delta Tb = BP Solution – BP Solvent Delta Tb = 97.2-100 = -2.8 Calculate M Delta Tb/ikb M = Delta Tb/l Times Kb M =-2.8/1 Times 512 Degree C/m M = -3.31 Mol/kg.

What is the boiling point of a 1.5 m NaCl solution?

101.5 °C. User is waiting for your help. Add your answer and earn points.

How do you calculate KF in water?

Divide the freezing point depression by the molal concentration so you have: Kf = delta Tf / cm. Insert the values for delta Tf and cm. For instance, if you have a solution with a molality of 0.455 which freezes at 3.17 degrees Celsius, then Kf would equal 3.17 divided by 0.455 or 6.96 degrees Celsius.

What is the freezing point of KCL?

770 °C

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What is the formula for freezing point?

The freezing point depression ∆T = KF·m where KF is the molal freezing point depression constant and m is the molality of the solute. Rearrangement gives: mol solute = (m) x (kg solvent) where kg of solvent is the mass of the solvent (lauric acid) in the mixture.

What is the KF of benzoic acid?

2. Calculate molality (m), in mol/kg, using the formula, ∆t = Kf • m (Kf = 3.9°C-kg/mol for lauric acid). Calculate the experimental molecular weight of benzoic acid, in g/mol. Use the original mass of benzoic acid from the Data and Calculations table, and the moles of benzoic acid you found in the previous step.

What is the kb of benzene?

Kb(benzene) = 2.53 °C/m In A Laboratory Experiment, Students Synthesized A New Compound And Found That When 14.35 Grams Of The Compound Were Dissolved In 215.6 Grams Of Benzene, The Solution Began To Boil At 80.575 °C. The Compound Was Also Found To Be Nonvolatile And A Non-electrolyte.

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