Importance of Studying Physical Pharmacy
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Importance of Studying Physical Pharmacy

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Questions and Answers

What is a key reason highlighted in the text for studying Physical Pharmacy?

  • To understand the mathematical principles of pharmacy
  • To learn about solubility solutions
  • To be able to make rational decisions based on scientific principles (correct)
  • To focus on the practical applications of pharmaceutical dosage forms
  • Which field of study is integrated in Physical Pharmacy according to the text?

  • History
  • Mathematics (correct)
  • Literature
  • Biology
  • What aspect does Physical Pharmacy primarily focus on, as mentioned in the text?

  • Understanding chemical reactions
  • Solving mathematical equations
  • Exploring theories behind dosage form design (correct)
  • Researching biological mechanisms
  • How does Physical Pharmacy contribute to pharmaceutical product understanding?

    <p>By elucidating the physical and chemical phenomena</p> Signup and view all the answers

    What types of pharmaceutical products are mentioned as being covered by Physical Pharmacy studies?

    <p>Solutions, emulsions, and ophthalmic products</p> Signup and view all the answers

    What does solubility solution refer to according to the text?

    <p>A homogeneous dispersion of solute in solvent</p> Signup and view all the answers

    What is the unit of molarity?

    <p>mol L-1</p> Signup and view all the answers

    According to the table provided, a substance requiring 1000 to 10000 parts of solvent for one part of solute is classified as:

    <p>Very slightly soluble</p> Signup and view all the answers

    Which method is used for determining drug concentration after leaving the solution for equilibrium?

    <p>Filtration</p> Signup and view all the answers

    What does molarity represent?

    <p>Number of moles of solute per 1 liter of solution</p> Signup and view all the answers

    In which type of solubility study do we examine the concentration of a dissolved gas in equilibrium with the pure gas above the solution?

    <p>Solubility of gases in liquids</p> Signup and view all the answers

    What is the primary factor that influences the solubility of gases in liquids?

    <p>Temperature</p> Signup and view all the answers

    What does Henry's Law state about the concentration of dissolved gas?

    <p>It is directly proportional to the partial pressure of the gas.</p> Signup and view all the answers

    How does the addition of electrolytes or non-electrolytes affect salting out?

    <p>It increases salting out.</p> Signup and view all the answers

    What is the consequence of chemical reaction 12 in relation to gas solubility?

    <p>It decreases the solubility of gases like hydrogen chloride.</p> Signup and view all the answers

    In a liquid-liquid system exhibiting partial miscibility, what happens when water and ether are mixed?

    <p>They form two separate layers each containing some of the other liquid.</p> Signup and view all the answers

    What effect does high vapor pressure have on ethyl nitrate in a hot climate?

    <p>It enhances evaporation of ethyl nitrate.</p> Signup and view all the answers

    What type of solution is formed when volatile oils are mixed with alcohol?

    <p>Hydroalcoholic solution</p> Signup and view all the answers

    Study Notes

    Solution and Solubility

    • There are different ways to express solubility: % w/w (grams of solute / 100 grams of solution), % w/v (grams of solute / 100 ml of solution), and % v/v (milliliters of solute / 100 ml of solution)
    • Molarity is defined as the number of moles of solute per 1 liter of solution, with a unit of mol/L
    • Molality is defined as the number of moles of solute per 1 kilogram of solvent
    • Mole fraction is the ratio of the number of moles of solute to the total number of moles of solute and solvent

    Pharmacopeia Classification of Solubility

    • Very soluble: less than 1 part of solvent required for 1 part of solute
    • Freely soluble: 1 to 10 parts of solvent required for 1 part of solute
    • Soluble: 10 to 30 parts of solvent required for 1 part of solute
    • Sparingly soluble: 30 to 100 parts of solvent required for 1 part of solute
    • Slightly soluble: 100 to 1000 parts of solvent required for 1 part of solute
    • Very slightly soluble: 1000 to 10000 parts of solvent required for 1 part of solute
    • Practically insoluble: more than 10000 parts of solvent required for 1 part of solute

    Determination of Solubility

    • Excess drug is added to the solvent in a stoppered conical flask
    • The mixture is shaken at a constant temperature for a specified period
    • The mixture is left to equilibrate, then filtered, and the drug concentration is determined using a suitable method

    Types of Solubility

    • Solubility of gases in liquids
    • Solubility of liquids in liquids
    • Solubility of solids in liquids

    Factors Affecting Solubility of Gases in Liquids

    • Pressure: Henry's Law states that the concentration of dissolved gas is proportional to the partial pressure of the gas above the solution
    • Temperature: the solubility of gases decreases as temperature increases
    • Salting Out: the addition of electrolytes or non-electrolytes can affect solubility
    • Chemical Reaction: chemical reactions can affect the solubility of gases in liquids

    Solubility of Liquids in Liquids

    • Complete Miscibility: two liquids mix in all proportions, forming one layer
    • Partial Miscibility: two liquids mix, but two layers are formed, each containing some of the other liquid

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    Description

    Learn about the importance of studying Physical Pharmacy and how it plays a crucial role in understanding subsequent courses in pharmaceutical technology. Explore the fundamental aspects that Physical Pharmacy integrates into pharmacy education.

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