Properties of Solutions Lab - Electrolytes vs. Non-Electrolytes

These flashcards cover key concepts related to the properties of solutions, particularly focusing on electrolytes and non-electrolytes, their behaviors in solution, and important chemical principles discussed in the laboratory.

What are electrolytes and non-electrolytes?

Electrolytes are substances that conduct electricity when dissolved in water, while non-electrolytes do not conduct electricity.

What is the significance of conductivity in solutions?

Conductivity measures the presence and mobility of ions in a solution, indicating the solution's ability to conduct electricity.

How does sodium behave as an element in the periodic table?

Sodium is a metal in Group 1 (Alkali Metal) and tends to lose one electron to form a cation (Na+).

How does chlorine behave as an element in the periodic table?

Chlorine is a non-metal in Group 17 (Halogen) and tends to gain one electron to form an anion (Cl-).

What type of bond is formed between sodium and chlorine?

An ionic bond is formed when sodium transfers an electron to chlorine, resulting in the attraction between Na+ and Cl- ions.

What is the electron configuration of sodium?

The electron configuration of sodium is 1s² 2s² 2p⁶ 3s¹.

What is the importance of ionization energy in metals like sodium?

Sodium has a low ionization energy, making it easier to lose its outer electron and form a positive ion.

How does water interact with ionic compounds like sodium chloride?

Water molecules solvate the ions, pulling Na+ and Cl- apart due to its polar nature, allowing the compound to dissociate.

What is the concept of lattice energy in ionic compounds?

Lattice energy is the energy released when oppositely charged ions in the gas phase combine to form a solid ionic compound.

How does the van't Hoff factor relate to electrolytic strength?

The van't Hoff factor indicates how many particles a solute forms in solution; higher values correspond to stronger electrolytes.

What observation indicates that sodium chloride is a strong electrolyte?

Sodium chloride completely dissociates into its ions in solution, resulting in high conductivity.

What reaction occurs when sodium and chlorine gas react?

2 Na (s) + Cl₂ (g) → 2 NaCl (s), forming sodium chloride.

What is the effect of temperature on solubility and conductivity of solutions?

Generally, higher temperatures increase solubility and conductivity by providing more energy for the dissolution process.

What role do hydrogen bonds play in the properties of water?

Hydrogen bonds contribute to the unique properties of water, such as its high surface tension, boiling point, and solvent capabilities.

What is conductivity dependent on in solutions?

Conductivity is directly related to the concentration of ionic species in solution and their mobility.

What does an increase in disorder (entropy) indicate when dissolving a solute in a solvent?

It indicates that the solute is becoming more dispersed in the solvent, which can drive the dissolution process.

What is the oxidation half-reaction for sodium?

The oxidation half-reaction for sodium is: Na → Na⁺ + e⁻.

What is the reduction half-reaction for chlorine?

The reduction half-reaction for chlorine is: Cl₂ + 2e⁻ → 2Cl⁻.

How does the reaction between sodium and chlorine relate to the conservation of mass?

The balanced reaction shows that the number of atoms for each element is conserved, supporting the law of conservation of mass.

What is the electron-dot notation for sodium and chlorine?

Sodium has one dot (1 valence electron), while chlorine has seven dots (7 valence electrons).