Flashcards on Steam distillation and essential oils
Steam Distillation and Essential Oils: A Student's Guide
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Steam Distillation
46 cards
Card 1
Question: What is steam distillation used for?
Answer: Steam distillation is a gentle and effective separation technique used for the extraction of essential oils from plant materials.
Card 2
Question: What types of compounds is steam distillation specifically designed for?
Answer: Steam distillation is specifically designed for compounds that are heat-sensitive, have high boiling points, and are immiscible with water.
Card 3
Question: What is the primary advantage of steam distillation?
Answer: The primary advantage of steam distillation is its ability to purify substances at temperatures significantly below their normal boiling points, preve
Card 4
Question: What is the fundamental principle behind steam distillation?
Answer: The fundamental principle behind steam distillation relies on the behavior of immiscible liquids and Dalton's Law of Partial Pressures.
Card 5
Question: What are immiscible liquids?
Answer: Immiscible liquids are those that do not mix to form a homogeneous solution; instead, they form separate layers, like oil and water.
Card 6
Question: How does Dalton's Law of Partial Pressures apply to immiscible liquids in steam distillation?
Answer: When two immiscible liquids are heated together, each liquid exerts its own vapor pressure independently of the other, and the total pressure is the s
Card 7
Question: What is the formula for the total vapor pressure (P_total) above a mixture of two immiscible liquids, water (w) and an essential oil (o)?
Answer: P_total = P_w + P_o
Card 8
Question: When does boiling occur in the context of steam distillation?
Answer: Boiling occurs when the total vapor pressure of the liquid mixture (P_w + P_o) equals the external atmospheric pressure (P_atm).
Card 9
Question: Why does a mixture of immiscible liquids in steam distillation boil at a temperature lower than the boiling point of either pure component?
Answer: Because both components contribute to the total vapor pressure, the mixture will reach the boiling point at a lower temperature than the boiling point
Card 10
Question: What is the approximate mass ratio (m_o / m_w) in the distillate for water and an essential oil?
Answer: m_o / m_w = (P_o · M_o) / (P_w · M_w), where M_o and M_w are the molar masses of the essential oil and water, respectively.