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Back to the Chemistry 2000 test index Chemistry 2000, Fall 96, Test 2 Solutions 1. If the osmotic pressure is rising, then the total concentration of solutes must be increasing. This suggests that the starch is breaking down into its constituent units. 1. Solutes depress the freezing points of solvents. Since salt is very soluble in water, salt- water solutions can have very low freezing points. 2. Ethanol is volatile. It might melt the ice on a road very quickly, but it would quickly evaporate and the ice would refreeze. 2. In water, the sodium sulfite will dissociate into 1.98mol of and 3.96mol of ions. Using the molar density of water, we have The mole fraction of water is therefore Since only the water is volatile in this solution, the vapour pressure of the solution is entirely due to the water: 1. The concentration of hydroxide is therefore The activity of hydroxide is 1.3. From the equation, we have 2. Some of the acid is neutralized by the base, so after the addition, we have
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test2s - Up: Back to the Chemistry 2000 test index...

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