135. Solving a chemistry problem
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- A solution containing 1.632 * 10-3 kg of trichloroacetic acid in 0.1 kg of benzene crystallizes at a temperature 0.350 C lower than pure benzene. Determine if trichloroacetic acid dissociates or associates in benzene solution and to what extent. The molar decrease in the crystallization temperature of benzene is 5.16 C.
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Option 12 At temperature T, the vapor pressure of a solution of concentration c, % of an unknown non-volatile substance in a liquid solvent is equal to P Pa; the density of this solution d. The dependence of saturated vapor pressure on temperature over a liquid and solid pure solvent is given in Table 1 (Appendix):
- calculate the molecular weight of the solute;
- determine the molar and molar concentrations of the solution;
- calculate the osmotic pressure of the solution;
- build a curve P - f (T) for a given solution and solvent;
- determine graphically the temperature at which the vapor pressure over a pure solvent will be equal to R Pa;
- determine graphically the increase in the boiling point at pressure P of a solution of a given concentration c;
- calculate the ebullioscopic constant in all possible ways and compare these values with each other at normal boiling point (T n.t.c.)
- determine the drop in freezing point
- calculate the cryoscopic constant
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