Chemistry: Solubility Principles

Questions and Answers

Which type of solutes dissolve readily in benzene?

Hydrophilic solutes

Non-polar solutes (correct)

Polar solutes

Ionic compounds

What happens when a solid solute is added to a solvent?

Dissolution occurs, leading to an increase in solute concentration. (correct)

The solution becomes saturated without further addition.

The solid solute completely disintegrates into gas.

Crystallization immediately stops the process.

What defines a saturated solution?

A solution where no more solute can be dissolved at the same conditions. (correct)

A solution that has no solute present.

A solution with a constantly decreasing concentration of solute.

A solution that is incapable of reaching dynamic equilibrium.

What is the process called when solute particles collide with solid solute particles and separate out of solution?

Crystallization Signup and view all the answers

When reaches a stage where dissolution and crystallization occur at the same rate, what is this state called?

Dynamic equilibrium Signup and view all the answers

Which of the following describes an unsaturated solution?

A solution that can still dissolve more solute. Signup and view all the answers

What is the significance of similar intermolecular interactions in solute and solvent for dissolution?

It facilitates the process of dissolution predominantly. Signup and view all the answers

What occurs when the concentration of solute in a solution remains constant?

Dynamic equilibrium has been established. Signup and view all the answers

What is the formula for calculating molar mass of the solute using osmotic pressure?

M2 = w2 R T / ∏ V Signup and view all the answers

Which of the following is a key advantage of using osmotic pressure to determine molar masses?

It provides accurate measurements at room temperature. Signup and view all the answers

What are two solutions with the same osmotic pressure called?

Isotonic solutions Signup and view all the answers

Why is the osmotic pressure method particularly useful for biomolecules?

They are generally unstable at higher temperatures. Signup and view all the answers

Which of the following properties is notably large even for dilute solutions?

Osmotic pressure Signup and view all the answers

What happens when isotonic solutions are separated by a semipermeable membrane?

No osmosis occurs between them. Signup and view all the answers

Which equation represents the relationship between the mass of solute, molar mass, and number of moles?

w2 = n2 M2 Signup and view all the answers

What is the significance of using molarity rather than molality in osmotic pressure measurements?

Molarity is easier to measure accurately. Signup and view all the answers

What does the symbol Kf represent in the context of freezing point depression?

Freezing Point Depression Constant Signup and view all the answers

Which equation correctly expresses the relationship between molality and freezing point depression?

DTf = Kf * (w2 / M2) / (w1 / 1000) Signup and view all the answers

What must be known to determine the molar mass of the solute using freezing point depression?

Values of Kf and the mass of solvent Signup and view all the answers

In the equation DTf = Kf * (w2 / M2) / (w1 / 1000), what does w2 represent?

Mass of the solute Signup and view all the answers

Which of the following is NOT a unit of Kf?

Pa kg mol-1 Signup and view all the answers

What is required to calculate DTf from the mass of solute and mass of solvent?

Values of Kf and the masses involved Signup and view all the answers

If the mass of solvent is doubled, how will it affect the freezing point depression, DTf?

DTf will decrease Signup and view all the answers

What is the significance of knowing Kf for a solvent in freezing point depression calculations?

It allows for accurate determination of solute properties Signup and view all the answers

What does Raoult's law state about the partial vapor pressure of a component in a solution?

It is directly proportional to its mole fraction present in solution. Signup and view all the answers

Which equation represents the vapor pressure of pure component 1 at equilibrium?

p1 = p10 x1 Signup and view all the answers

How is the total pressure of the solution phase calculated according to Dalton’s law?

ptotal = p1 + p2 Signup and view all the answers

What does the equation ptotal = x1 p10 + x2 p20 signify?

It represents the relationship between mole fraction and component pressure. Signup and view all the answers

What does x1 represent in the context of Raoult's law?

The mole fraction of pure component 1 in the solution. Signup and view all the answers

According to Raoult's law, what happens to p1 if x1 increases?

p1 increases proportionately. Signup and view all the answers

In the equation ptotal = p10 + (p20 – p10) x2, what does p20 represent?

The vapor pressure of pure component 2. Signup and view all the answers

What conclusion can be drawn from equation ptotal = p10 + (p20 – p10) x2?

The change in total pressure is linearly related to the mole fraction of component 2. Signup and view all the answers

What does the term 'binary solution' refer to?

A solution consisting only of two components, either liquids or solids in liquids. Signup and view all the answers

In a binary solution of volatile liquids, what happens to the two components in a closed vessel?

Both components evaporate, establishing an equilibrium. Signup and view all the answers

What is indicated by the term 'partial vapor pressures' in a binary solution?

The pressure contributed by each individual volatile component in the vapor phase. Signup and view all the answers

What is the significance of Raoult's law in relation to vapor pressure in solutions?

It gives a quantitative relationship between the total vapor pressure and the mole fractions of the components. Signup and view all the answers

When considering 500 mL of soda water packed under 2.5 atm of CO2 pressure, what principle applies to the solubility of CO2 in the water?

Higher pressure increases the solubility of CO2 at a given temperature. Signup and view all the answers

Which of the following describes a liquid solution formed when the solvent is a liquid?

It may contain a combination of gases, liquids, or solids as solutes. Signup and view all the answers

What results from the vapor pressure of a binary solution when an equilibrium is established?

It balances the vapor pressures of both components with their respective mole fractions. Signup and view all the answers

Which statement accurately represents the characteristics of vapor-liquid systems?

They establish a dynamic equilibrium between vapor and liquid phases. Signup and view all the answers

Study Notes

Solubility and Dissolution

Naphthalene and anthracene dissolve easily in benzene, whereas sodium chloride and sugar do not.
Polar solutes typically dissolve in polar solvents, while non-polar solutes dissolve in non-polar solvents, following the principle of "like dissolves like."
Dissolution occurs when a solid solute is added to a solvent, increasing solute concentration in the solution.
Crystallization is the process where solute particles collide with the solid and separate from the solution.
A dynamic equilibrium is reached when the rate of dissolution equals the rate of crystallization, maintaining constant solute concentration under specific conditions (temperature and pressure).
Saturated solutions contain the maximum amount of solute that can dissolve at given conditions, while unsaturated solutions can accommodate more solute.

Vapour Pressure of Liquid Solutions

Liquid solutions can contain gases, liquids, or solids dissolved in a liquid solvent.
In a binary solution with two volatile liquids, an equilibrium between the vapor phase and liquid phase is established.
Total vapor pressure (ptotal) is the sum of partial vapor pressures (p1 and p2) of the components related to their mole fractions (x1 and x2).
Raoult’s law quantifies this relationship, stating that the partial vapor pressure of a component is directly proportional to its mole fraction.

Molar Mass Determination through Colligative Properties

Freezing Point Depression Constant (Kf) is a proportionality constant specific to the solvent, aiding in calculating the depression in freezing point (DTf).
Molar mass of the solute can be determined using the equation involving w2 (grams of solute), M2 (molar mass), and w1 (grams of solvent).
Molar mass can also be calculated using osmotic pressure (π), with pressure measurements conducted at room temperature.
Isotonic solutions have the same osmotic pressure; no osmosis occurs between solutions separated by a semipermeable membrane.

Applications of Osmotic Pressure

Widely utilized for measuring molar masses of biomolecules, proteins, and polymers due to stability at lower temperatures.
Osmotic pressure measurements are effective for dilute solutions where colligative properties are more noticeable.

Studying That Suits You

Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

Description

This quiz explores the principles of solubility, including the concepts of polar and non-polar solutes and solvents. Understand how intermolecular interactions dictate the dissolution process and learn why certain substances dissolve in specific solvents. Perfect for students studying basic chemistry.