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A solution contains 0.1 mol of acetamide...

A solution contains `0.1 mol` of acetamide `[CH_(3)CONH_(2)]` in `1 dm^(3)` of glacial acetic acid. When the solution is cooled, the first crystals that appeared at freezing point contain the molecules of

A

both acetamide and acetic acid

B

acetic acid only

C

acetamide only

D

either acetamide or acetic depending upon the conditions of the experiment

Text Solution

Verified by Experts

The correct Answer is:
2
When a dilute solution containing a nonvolatile solute freezes, it is the volatile solvent that begins to solidify first, leaving the solute in a more concentrated solution.
Solvent moleculaes in a solution are somewhat separated fromone another (because of solute particles) than they are in the pure solvent. Consequently, the temperature of a solution must be lowered below the freezing point of the pure solvent to freeze it.
Note that the solute must be nonvolatile in the case of boiling point elevation but no such restriction applies to freezing point depression. For example, methanol `(CH_(3)OH)`, a fairly volatile liquid that boils at only `65^(@)C`, has sometimes been used as an antifreeze in automobile radiators.
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Knowledge Check

  • A buffer solution contains 0.1 mol each of NaCH_(3)COO and CH_(3)COOH . On diluting the solution to double its volume, the pH of the solution

    A
    will because half
    B
    will remain unchanged
    C
    will be doubled
    D
    cannot be predicted

  • A molal solution is one that contains 1 mol of a solute in

    A
    `1000 g` of solvent
    B
    `1 L` of solven
    C
    `1 L` of solution
    D
    `22.4 L` of solution

  • A buffer solution contains 0.1 mole of sodium acetate in1000 cm^(3) of 0.1 M acetic acid. To the above buffer solution, 0.1 mole of sodium acetate is further added and dissolved. The pH of the resulting buffer is equal to

    A
    `pK_(a) + log 2`
    B
    `pK_(a)`
    C
    `pK_(a) + 2`
    D
    `pK_(a) + log 2`