(Use the spaces provided for the answers and additional paper if necessary.) 1.

Question

(Use the spaces provided for the answers and additional paper if necessary.) 1. Distinguish between solute and solvent. 2. List three colligative properties 3. Distinguish between volatile and nonvolatile substances. 4. What effect does the presence of a nonvolatile solute have upon: a. the vapor pressure of a solution b. the freezing point c. the boiling point 5. What is supercooling? How can it be minimized? 6. What is the molality of benzene in a solution that contains 6.502 g of benzene in 162.7 g of chloroform/CHCI,? (K, for CHC, is 4.68 ckg/mol, f.p. of CHCl, is 635'C) 7. A solution containing 1.00 g of an unknown substance in 12.5 g of naphthalene was found to freeze at 75.4°C. What is the molar mass of the unknown substance? (K, for naphthalene is 6.94 °C kg/mol, fp. of naphthalene is 80.29"C)

Explanation / Answer

Hi,

Answer #1: The substance which dissolves another substance is said solvent, while the substance which gets dissolved in the solvent is said solute.

Answer #2:

i) Lowering of vapor pressure

ii) Elevation of boiling point

iii) Osmotic pressure

Answer #3:

Answer #4: Effect of presence of non-volatile solute :

a) The vapor pressure of a solution is lowered when a non-volatile solute is dissolved in it to form a solution.

b) Freezing point depresses.

c) Boiling point elevates.

Thanks, please share your valuable feedback.

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