Advertisements
Advertisements
प्रश्न
Calculate molar conductivities at zero concentration for CaCl2 and NaCl.
Given: molar ionic conductivities of Ca2+, Cl–, Na+ ions are respectively, 104, 76.4, 50.1 Ω–1 cm–2 mol–1
Advertisements
उत्तर
Given:
`lambda_("Ca"^(2+))^0` = 104 Ω–1 cm2 mol–1,
`lambda_("Cl"^(-))^0` = 76.4 Ω–1 cm2 mol–1,
`lambda_("Na"^(+))^0` = 50.1 Ω–1 cm2 mol–1,
To find: Molar conductivity at zero concentration for CaCl2 and NaCl:
∧0 (CaCl2) and ∧0 (NaCl)
Formula: ∧0 = `"n"_+ lambda_+^0 + "n"_(-)lambda_(-)^0`
Calculation: According to Kohlrausch law,
∧0(CaCl2) = `lambda_("Ca"^(2+))^0` + `2lambda_("Cl"^(-))^0`
= 104 Ω–1 cm2 mol–1 + 2 × 76.4 Ω–1 cm2 mol–1
= 256.8 Ω–1 cm2 mol–1
∧0(NaCl) = `lambda_("Na"^(+))^0` + `lambda_("Cl"^(-))^0`
= 50.1 Ω–1 cm2 mol–1 + 76.4 Ω–1 cm2 mol–1
= 126.5 Ω–1 cm2 mol–1
Molar conductivity at zero concentration of CaCl2 is 256.8 Ω–1 cm2 mol–1
Molar conductivity at zero concentration of NaCl is 126.5 Ω–1 cm2 mol–1
APPEARS IN
संबंधित प्रश्न
The molar conductivity of 0.05 M BaCl2 solution at 25° C is 223Ω-1 cm2 mol-1. What is its conductivity?
Answer the following in brief.
Explain the effect of dilution of the solution on conductivity.
Answer the following:
What is Kohlrausch law of independent migration of ions? How is it useful in obtaining molar conductivity at zero concentration of a weak electrolyte? Explain with an example.
In case of weak electrolyte the graph Λ vs `sqrt"c"` is _______.
The molar conductivity and conductivity of AgNO3 solution is 121.4 Ω–1 cm2 mol–1 and 2.428 × 10–3 Ω–1 cm–1 at 25 °C. What is molar concentration of AgNO3 solution?
Write an equation that shows the relationship between molar conductivity and degree of dissociation of weak electrolyte.
Write applications of Kohlrausch’s Law.
The CORRECT unit of molar conductivity is ____________.
For the reaction \[\ce{A -> B}\], the rate increases by a factor of 2.25 when the concentration of A is increased by 1.5. What is the order of the reaction?
What will be the concentration of NaCl solution, if the molar conductivity and conductivity of NaCl solution is 124.3 Ω−1 cm2 mol−1 and 1.243 × 10−4 Ω−1 cm2 respectively?
The molar conductances at infinite dilution `(∧_0)` for electrolytes B+A− and C+A− are 140 and 120 S cm2 mol−1. The molar conductance at infinite dilution for B+X− is 198 S cm2 mol−1. The `∧_0` (in S cm2 mol−1) of C+X− is __________.
The conductivity of 0.02 M solution of NaCl is 2.6 × 10−2 S cm−1. What is its molar conductivity?
Which among the following solution has the highest conductivity (k) value?
Conductivity of KCI solution is 0.0027 Ω−1 m−1 at 25°C. The resistance of the solution is 82.4 Ω. The cell constant is ____________ m−1.
The molar conductivities at infinite dilution for sodium acetate, HCI and NaCl are 91 S cm2 mol-1, 425.9 S cm2 mol-1 and 126.4 S cm2 mol-1 respectively. The molar conductivity of acetic acid at infinite dilution is ______.
Which of the following graph represents the variation of `∧` with `sqrt"c"` for acetic acid solution?
What is the relation between cell constant, conductivity and electrical resistance?
Conductivity of a conductor is ____________.
What is the unit of electrical conductance?
What will be the concentration of NaCl solution, if the molar conductivity and conductivity of NaCl solution is 124.3 Ω-1 cm2 mol-1 and 1.243 × 10-4 Ω-1 cm2 respectively?
What is the conductivity of 0.01 M NaCl solution if resistance and cell constant of NaCl solution are 375 ohms and 0.5 cm-1 respectively at 298 K?
If the resistivity of 0.1 M KCI solution is 50 Ω cm, what is it's molar conductivity?
The value of [H3O+] in mol lit–1 of 0.001 M acetic acid solution (Ka = 1.8 × 10–5) is ______.
What is the SI unit of conductivity?
Which of the following has least conductivity in aqueous solution?
What is the SI unit of molar conductivity?
Write the relation between molar conductivity and molar ionic conductivities for the electrolytes:
- Na2SO4
- AlCl3
