Question

The molar conductivities at zero concentration for Ca²⁺ and CaCl₂ are 104 and 256.8 Ω⁻¹ cm² mol⁻¹ respectively. The molar conductivity at zero concentration for Cl⁻ is ____________.

Options

• 76.4 Ω⁻¹ cm² mol⁻¹

• 152.8 Ω⁻¹ cm² mol⁻¹

• 180.4 Ω⁻¹ cm² mol⁻¹

• 305.6 Ω⁻¹ cm² mol⁻¹

Answer 1

The molar conductivities at zero concentration for Ca²⁺ and CaCl₂ are 104 and 256.8 Ω⁻¹ cm² mol⁻¹ respectively. The molar conductivity at zero concentration for Cl⁻ is 76.4 Ω⁻¹ cm² mol⁻¹.

Explanation:

`∧_0` (CaCl₂) = `λ_(Ca^(2+))^0 + 2λ_(Cl^-)^0`

256.8 Ω⁻¹ cm² mol⁻¹ = 104 Ω⁻¹ cm² mol⁻¹ + 2 × x Ω⁻¹ cm² mol⁻¹

x = 76.4 Ω⁻¹ cm² mol⁻¹