Electrochemistry — Flashcards
Maharashtra Board · Class 12 · Chemistry
30 flashcards for Electrochemistry (Maharashtra Board Class 12 Chemistry) to test yourself on key terms and facts.
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What is electrochemistry and what are its main applications?
Answer
Electrochemistry is the area of chemistry concerned with interconversion of chemical and electrical energy. Main applications include: • Manufacturing of NaOH, fluorine production • Electro-refining a…
Distinguish between metallic conduction and electrolytic conduction.
Answer
Metallic Conduction: • Direct flow of electrons • Electronic conductors • No chemical change • Conductivity decreases with temperature Electrolytic Conduction: • Movement of ions • Ionic conductors •…
Define conductivity (κ) and write its formula with units.
Answer
Conductivity (κ) is the electrical conductance of a conductor of unit length and unit area of cross section. Formula: κ = G × l/a = (1/R) × l/a Where: G = conductance, R = resistance, l = length, a …
What is molar conductivity (Λ) and how is it related to conductivity?
Answer
Molar conductivity (Λ) is the electrolytic conductivity divided by molar concentration. Formula: Λ = κ/c = 1000κ/c Where: κ = conductivity, c = molar concentration Units: S m² mol⁻¹ (SI) or Ω⁻¹ cm²…
How does conductivity vary with concentration? Explain with reasoning.
Answer
Conductivity DECREASES with dilution (decreasing concentration). Reason: • Conductivity depends on number of ions per unit volume • On dilution, total ions increase due to increased dissociation • Bu…
State Kohlrausch's Law of Independent Migration of Ions and write its mathematical expression.
Answer
Kohlrausch's Law: At infinite dilution, each ion migrates independent of co-ion and contributes to total molar conductivity irrespective of nature of other ion. Mathematical Expression: Λ° = n₊λ°₊ + …
How can Kohlrausch's Law be used to calculate Λ° of weak electrolytes? Give example with CH₃COOH.
Answer
For weak electrolytes, Λ° cannot be determined by extrapolation. Use Kohlrausch's Law with strong electrolytes. For CH₃COOH: Λ°(CH₃COOH) = λ°ₕ₊ + λ°CH₃COO₋ Calculation: Λ°(CH₃COOH) = Λ°(HCl) + Λ°(CH…
What is the relationship between degree of dissociation (α) and molar conductivity for weak electrolytes?
Answer
For weak electrolytes: α = Λc/Λ° Where: • α = degree of dissociation • Λc = molar conductivity at concentration c • Λ° = molar conductivity at infinite dilution This relationship connects: • Electro…
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