thanks EXPERIMENT 1: PREPARATION OF ETHANOL FROM SUCROSE 33 Post-Lab Questions:

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EXPERIMENT 1: PREPARATION OF ETHANOL FROM SUCROSE 33 Post-Lab Questions: (Remember to always answer in full sentences and provide explanations to your answers.) There is more than 100 mL of solution in the flask. How can you determine the total amount of ethanol produced in the reaction by examining only 25.0 mL of distillate? 1. 2. In the fermentation if you used more sugar could you produce a 90 % ethanol solution prior to distillation? Explain your answer rite the chemical equation for the formation of a precipitate if the tube leading from the fermentation flask was placed in a calcium hydroxide solution instead of water. (Hint: What happens to CO2 when it dissolves in water? Think about what you learned in general chemistry.) 3. W

Explanation / Answer

1. We can back-calculate to find the total amount of ethanol produced. We know that how much ethanol we took for distillation. So, we can calculate that 25.0 ml of distillate is produced from how much ethanol and then 100 ml of solution in flask produced how much pure ethanol.

2. We cannot produce 90 % ethanol solution even if we take more of sugar. Because water and ethanol forms an azeotropic mixture at 78.15 oC. Even if we take more of sugar, even then they will form azeotropic mixture with the same combination and at same temperature.

3. If calcium hydroxide solution is placed in place of water then,

Ca(OH)2 + CO2 ----> CaCO3 + H2O

CaCO3 will be formed as precipitate and water will also be produced.

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