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    What is the chemical role of sodium carbonate (Na2CO3) in caffeine extraction?

    It increases pH, converting caffeine to a more soluble free-base form.

    Why extract caffeine twice with 20 mL of solvent instead of once with 40 mL?

    To enhance extraction efficiency and maximize caffeine yield.

    What is the function of anhydrous sodium sulfate?

    It removes traces of water from the organic phase.

    What factors determine the choice of an extraction solvent?

    Solvent must dissolve caffeine, be immiscible with water, and low in toxicity.

    Why should the temperature not exceed 40°C when evaporating the solvent?

    To prevent caffeine decomposition and avoid breaking the beaker.

    What is the role of the rotary evaporator?

    It separates caffeine from the solvent by evaporation under reduced pressure.

    What is the purpose of recrystallization?

    To purify solid organic compounds by removing impurities based on solubility differences.

    What solvent is used during recrystallization?

    Distilled water is typically used.

    What factors should be considered when choosing a solvent for recrystallization?

    Solubility in hot and cold states, and reactivity with the compound.

    What are the isomers of the molecule C4H10O?

    There are three alcohol isomers: butanol, isobutanol, and tert-butanol.

    What is the most stable conformer of butane diol?

    The staggered conformer is more stable due to minimized steric strain.

    What is the purpose of using a reflux setup in synthesis?

    To heat the reaction mixture without losing volatile solvents.

    What role does ethanol play in the saponification reaction?

    It acts as a solvent that dissolves both oil and sodium hydroxide.

    Why is a saturated sodium chloride solution added after saponification?

    To decrease solubility and precipitate soap from the mixture.

    Why is soap washed with cold water after filtration?

    To remove impurities while minimizing soap loss.

    What is the general equation for saponification?

    Fat/Oil + Base → Glycerol + Soap.

    What types of soap are produced from sodium and potassium salts?

    Sodium salts yield hard soaps, while potassium salts yield soft soaps.

    What is the significance of the chair conformation of cyclohexane?

    It is the most stable conformation due to minimized steric strain.

    What is the effect of caffeine on blood pressure?

    Caffeine consumption can lead to increased blood pressure.

    What health benefit is associated with regular caffeine intake?

    It may lower the risk of developing Type 2 diabetes.

    What happens if caffeine consumption is stopped abruptly?

    Withdrawal symptoms such as headaches and fatigue may occur.

    What is the chemical role of sodium carbonate (Na2CO3) in caffeine extraction?

    It increases pH, converting caffeine to a more soluble free-base form.

    Why extract caffeine twice with 20 mL of solvent instead of once with 40 mL?

    To enhance extraction efficiency and maximize caffeine yield.

    What is the function of anhydrous sodium sulfate?

    It removes traces of water from the organic phase.

    What factors determine the choice of an extraction solvent?

    Solvent must dissolve caffeine, be immiscible with water, and low in toxicity.

    Why should the temperature not exceed 40°C when evaporating the solvent?

    To prevent caffeine decomposition and avoid breaking the beaker.

    What is the role of the rotary evaporator?

    It separates caffeine from the solvent by evaporation under reduced pressure.

    What is the purpose of recrystallization?

    To purify solid organic compounds by removing impurities based on solubility differences.

    What solvent is used during recrystallization?

    Distilled water is typically used.

    What factors should be considered when choosing a solvent for recrystallization?

    Solubility differences of the compound and impurities in hot and cold solvents.

    What are the isomers of the molecule C4H10O?

    There are three alcohol isomers: butanol, isobutanol, and tert-butanol.

    What is the most stable conformer of butane diol?

    The staggered conformation is the most stable due to minimized steric strain.

    What is the purpose of using a reflux setup in synthesis?

    To heat the reaction mixture without losing volatile solvents through evaporation.

    What role does ethanol play in the saponification reaction?

    It acts as a solvent that dissolves both oil and sodium hydroxide.

    Why is a saturated sodium chloride solution added after saponification?

    To decrease solubility of soap, causing it to precipitate from the mixture.

    Why is soap washed with cold water after filtration?

    To remove impurities while minimizing soap loss.

    What is the general equation for saponification?

    Fat/Oil + Base → Glycerol + Soap.

    What types of soap are produced from sodium and potassium salts?

    Sodium salts yield hard soaps, while potassium salts yield soft soaps.

    What is the principle behind recrystallization?

    Purifying a compound based on differences in solubility.

    What is the systematic name of caffeine?

    1,3,7-trimethyl-1H-purine-2,6(3H,7H)-dione.

    What are the health benefits of caffeine?

    It may protect brain cells and reduce risks of certain diseases.

    What are the effects of caffeine consumption?

    It can cause increased heart rate, insomnia, and dependency.