HSC Science (General) 12th Board ExamMaharashtra State Board
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Write the Formula to Determine the Molar Mass of a Solute Using Freezing Point Depresssion Method. - HSC Science (General) 12th Board Exam - Chemistry

ConceptColligative Properties and Determination of Molar Mass Depression of Freezing Point

Question

Write the formula to determine the molar mass of a solute using freezing point depresssion method.

Solution

Depression of freezing point and molar mass of the solute:
When W2 gram of solute with molar mass M2 is dissolved in W1 gram of solvent, the molality m is given by

m="Mass of solute in kg"/("Molar mass of solue in kg "×" Mass of solvent in kg")

m=W_2/(M_2*W_1)

∴ The molar mass of a solute using freezing depression method is givenby,

triangle T_f=(K_fW_2)/(M_2W_1)

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2015-2016 (March) (with solutions)
Question 1.2 | 2.00 marks

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Solution Write the Formula to Determine the Molar Mass of a Solute Using Freezing Point Depresssion Method. Concept: Colligative Properties and Determination of Molar Mass - Depression of Freezing Point.
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