Raoult's law describes the behavior of ideal solutions. It states that the vapor pressure of a solution is proportional to the mole fraction of the solvent in the solution. The vapor pressure of a solution is lower than that of the pure solvent due to the presence of nonvolatile solute particles. This lowering of vapor pressure leads to boiling point elevation and freezing point depression in solutions, as described by the colligative properties. The quantitative relationships for boiling point elevation and freezing point depression involve the molal concentration of the solute.
RAOULT'S LAW ( Physical & Analytical Chemistry)Hasnaın Sheıkh
Name; Hasnain Nawaz
Surname : Shaikh
ROLL NO: 16 CH 42
B.E: Chemical Engineering (In Progress).
Mehran University of Engineering and Technology
Jamshore, ISO 9001 Certified.
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Solubility of liquids in liquids, The term miscibility refers to the mutual solubility of the component of liquid - liquid system, Raoult’s Law, Raoult’s law may be mathematically expressed as: Ideal solution, Real solution
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Interfacial Tension
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Measurement of interfacial and surface tesion
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RELATIVE HUMIDITY, Humidity, Wet and Dry Hygrometer, LIQUID COMPLEX, LIQUID CRYSTALS, Types of liquid crystals, GLASSY STATES, Characteristics glassy state, Types of glassy state, What is the Glass Transition Temperature?
RAOULT'S LAW ( Physical & Analytical Chemistry)Hasnaın Sheıkh
Name; Hasnain Nawaz
Surname : Shaikh
ROLL NO: 16 CH 42
B.E: Chemical Engineering (In Progress).
Mehran University of Engineering and Technology
Jamshore, ISO 9001 Certified.
State of matter and properties of matter (Part-2) (Latent Heat, Vapour pressu...Ms. Pooja Bhandare
Latent Heat, Vapour pressure, Factor affecting vapour pressure, Surface area, Types of molecule, Temperature and Intermolecular forces, Sublimation Critical point
Surface and Interfacial tension [Part-3(a)](Measurement of Surface and Inter...Ms. Pooja Bhandare
MEASUREMENT OF SURFACE AND INTERFACIAL TENSION
Capillary Rise Method, Drop Count and Weight Method.
Wilhelmy Plate Methods ,The DuNouy Ring Method.
Capillary Rise Method: Upward force due to surface tension: Drop count and Weight method Downward Force: Drop weight method: Drop count method
Solubility of liquids in liquids, The term miscibility refers to the mutual solubility of the component of liquid - liquid system, Raoult’s Law, Raoult’s law may be mathematically expressed as: Ideal solution, Real solution
In this presentation:
Surface Tension
Interfacial Tension
Definition of inerfacial tension in different ways
Measurement of interfacial and surface tesion
State of matter and properties of matter (Part-6)(Relative humidity, Liquid ...Ms. Pooja Bhandare
RELATIVE HUMIDITY, Humidity, Wet and Dry Hygrometer, LIQUID COMPLEX, LIQUID CRYSTALS, Types of liquid crystals, GLASSY STATES, Characteristics glassy state, Types of glassy state, What is the Glass Transition Temperature?
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Immiscible liquids
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DIFFUSION,
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FICK’S SECOND LAW OF DIFFUSION
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INCLUDES SPREADING COEFFICIENT AND ITS THEORY AND ALSO FEW OF ITS APPLICATION IN PHARMACEUTICAL FIELD
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Winding up, also known as liquidation, refers to the legal and financial process of dissolving a company. It involves ceasing operations, selling assets, settling debts, and ultimately removing the company from the official business registry.
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Reasons for Winding Up:
Insolvency: This is the most common reason, where the company cannot pay its debts. Creditors may initiate a compulsory winding up to recover their dues.
Voluntary Closure: The owners may decide to close the company due to reasons like reaching business goals, facing losses, or merging with another company.
Deadlock: If shareholders or directors cannot agree on how to run the company, a court may order a winding up.
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Voluntary Winding Up: This is initiated by the company's shareholders through a resolution passed by a majority vote. There are two main types:
Members' Voluntary Winding Up: The company is solvent (has enough assets to pay off its debts) and shareholders will receive any remaining assets after debts are settled.
Creditors' Voluntary Winding Up: The company is insolvent and creditors will be prioritized in receiving payment from the sale of assets.
Compulsory Winding Up: This is initiated by a court order, typically at the request of creditors, government agencies, or even by the company itself if it's insolvent.
Process of Winding Up:
Appointment of Liquidator: A qualified professional is appointed to oversee the winding-up process. They are responsible for selling assets, paying off debts, and distributing any remaining funds.
Cease Trading: The company stops its regular business operations.
Notification of Creditors: Creditors are informed about the winding up and invited to submit their claims.
Sale of Assets: The company's assets are sold to generate cash to pay off creditors.
Payment of Debts: Creditors are paid according to a set order of priority, with secured creditors receiving payment before unsecured creditors.
Distribution to Shareholders: If there are any remaining funds after all debts are settled, they are distributed to shareholders according to their ownership stake.
Dissolution: Once all claims are settled and distributions made, the company is officially dissolved and removed from the business register.
Impact of Winding Up:
Employees: Employees will likely lose their jobs during the winding-up process.
Creditors: Creditors may not recover their debts in full, especially if the company is insolvent.
Shareholders: Shareholders may not receive any payout if the company's debts exceed its assets.
Winding up is a complex legal and financial process that can have significant consequences for all parties involved. It's important to seek professional legal and financial advice when considering winding up a company.
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2. Raoult's Law
• The common mathematical statement for
this behavior is known as Raoult's Law:
• Psoln = Xsolvent Psolvent
• Psoln is the observed vapor pressure of the
solution
• Xsolvent is the mole fraction
• Psolvent is the vapor pressure of the pure
solvent.
3. Raoult’s Law
• From Raoult’s law we see clearly that
the amount of change in the vapor
pressure is dependent on the amount
of the nonvolatile solute added to the
solution (mole fraction) not the quality
of the solute.
4. Raoult’s Law
• Raoult’s Law is a
linear equation
(y=mx+b)
• A plot of Psoln vs mole
fraction gives a
straight line with a
slope equal to Psolvent.
5. Vapor Pressure
• The pressure of the
vapor present.
• Vapor is the liquid
molecule in gas form
over the liquid
surface.
• Remove the liquid
and you have a gas!
6. Vapor Pressure of Solutions
• In a closed container at
constant temperature
an equilibrium vapor
pressure is
established.
• The picture on the left
indicates that vapor
molecules leave a
solvent to dilute a
solution. Why?
8. Vapor Pressure of Solutions
• The vapor pressure of a liquid is much
different in a solution than it is in a pure
liquid.
• The dissolved nonvolatile solute lowers
the vapor pressure of a solvent.
• The solute decreases the number of
solvent molecules per unit volume
lowering the tendency for the molecules to
escape into vapor.
9. Vapor Pressure of Solutions
• In a solution that is half nonvolatile
solute particles and half solvent, one
would expect a vapor pressure of 1/2
the pure solvent, since only half as
many molecules can escape.
• That is what is exhibited by such a
solution.
10. Ideal Solutions
• Liquid-liquid solutions that obey Raoult’s
Law are called ideal solutions.
• For solutions that contain volatile solutions
a modified Raoult’s Law.
• Ptotal = Pa + Pb = XaP°a +XbP°b
• Pa and Pb are the partial pressure of the
two liquids in solution.
• P°a and P°b are the partial pressure of the
pure solvent.
• X is the mole fraction.
12. Problems
• A solution is prepared by mixing 5.81 g
acetone (C3H6O, molar mass =58.1 g/mol)
and 11.9 g chloroform (HCCl3, molar
mass=119.4 g/mol). At 35°C, this solution
has a total vapor pressure of 260 torr. Is
this an ideal solution? The vapor
pressures of pure acetone and pure
chloroform at 35°C are 345 and 293
respectively.
13. Solution
• Ideal solutions follow Raoult’s Law.
• Moles of each volatile liquid:
• 5.81 g acetone/58.1 g/mol = 0.100 mol
ace
• 11.9 g chloro/119 g/mol= 0.100 mol chloro
• Equal number of moles thus mole fraction:
Xa = 0.500 Xc= 0.500
• Ptotal=(0.500)(345torr) +(0.500)(293 torr)
• Ptotal= 319 torr expected
14. Discussion
• Since the observed vapor pressure is 260
torr and the calculated vapor pressure is
319 torr, this is not an ideal solution.
• Why is the vapor pressure lower?
• IMF’s: both molecules have a dipoles and
these interactions reduce the molecules
tendency to escape. This lowers the
vapor pressure more than expected.
15. Colligative Properties
• These properties are known as the
colligative properties of solutions
(collected properties) and they are:
• vapor pressure lowering
• boiling point elevation
• freezing point depression
• osmotic pressure elevation
16. Boiling point Elevation
• Boiling occurs when the vapor
pressure of a liquid equals
atmospheric pressure. But since the
vapor pressure of a solution is always
lower than that of the pure solvent,
more heat will need to be applied to
raise it to atmospheric pressure.
17. Boiling Point Elevation
• The quantitative relationship which
describes this behavior looks like this:
• ∆ Tb = Kbm
• ∆ Tb is the change in the boiling point.
• Kb is the "molal boiling point constant"
which is a property of the solvent.
• m is the molality of the solute in the
solution. Why Molality?
19. Freezing Point Depression
• When you add salt to ice the ice melts and
the temperature of the solution drops.
The resulting solution will not freeze at 0
°C.
• Salt water has a lower vapor pressure
than pure water.
• Another way to look at it, is the particles
interfere with the water molecules’ ability
to form a crystal. The freezing point is
depressed.
21. Freezing Point Depression
• ∆ T=Kfm
• Where ∆ T is the freezing point
depression, the change in freezing point
between the pure solvent and the solution.
• Kf is the molal freezing point constant.
Values depend on the solvent.
• m is the molality of the solute in the
solution