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AP EAMCET2012ChemistrySolutions

The experimentally determined molar mass of a non-volatile solute, BaCl ₂ in water by Cottrell's method, is

Options

  1. Aequal to the calculated molar mass
  2. Bmore than the calculated molar mass
  3. Cless than the calculated molar mass
  4. Ddouble of the calculated molar mass

Correct answer

C. less than the calculated molar mass

Step-by-step solution

BaCl ₂ being ionic in nature, ionises completely to give Ba ²⁺ and 2 Cl ⁻(1+2=3) ions, i.e., number of particles increases in the solution. i= 3 1 =3= M_c M_o (where, M_c= calculated molar mass and M_o= observed molar mass) array ll & 3= M_c M_o or & M_o= M_c 3 i.e., & M_o < M_c array or observed molecular mass of BaCl ₂ is less than the calculated molecular mass.

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