Analytical Chemistry: Separation and Identification of Substances
28 Questions
0 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What type of indicator changes its color in acidic and basic solutions?

  • Colour indicators (correct)
  • Turbidity indicators
  • Concentration indicators
  • Fluorescence indicators

    • What is the formula used to calculate the equivalent factor (F) in titrations?

  • F = mol.w / normality * 1000
  • F = mol.w * normality / 1000 (correct)
  • F = 1000 / mol.w * normality
  • F = normality / mol.w * 1000

    • According to the Arrhenius theory, what does an acid ionize to give?

  • OH⁻
  • Both H⁺ and OH⁻
  • H⁺ (correct)
  • H₃O⁺

    • What is the relationship between an acid and its conjugate base according to the Brønsted-Lowry theory?

    <p>The conjugate base is the ion remaining after the acid has lost a proton.</p> Signup and view all the answers

    What is the concentration of a solution typically expressed in?

    <p>Grams per liter</p> Signup and view all the answers

    What is the purpose of a fluorescence indicator?

    <p>To form or lose a characteristic fluorescence at a given pH.</p> Signup and view all the answers

    What is the primary purpose of analytical chemistry?

    <p>To perform qualitative and quantitative analysis on chemical samples</p> Signup and view all the answers

    Which of the following is NOT a common technique used in analytical chemistry?

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

    In a titration, what is the purpose of the titrant?

    <p>It is the solution of known concentration used to react with the sample</p> Signup and view all the answers

    What is the purpose of performing a qualitative analysis prior to a quantitative analysis?

    <p>To select the appropriate analytical method for quantitation</p> Signup and view all the answers

    Which type of analysis is typically used to determine the mass of a substance?

    <p>Gravimetric analysis</p> Signup and view all the answers

    What is the primary difference between a normal solution and an empirical solution?

    <p>Normal solutions contain an equivalent weight of substance per liter, while empirical solutions are prepared to a specific concentration for a target substance.</p> Signup and view all the answers

    What is the purpose of using an indicator in a titration?

    <p>To detect the endpoint of the titration</p> Signup and view all the answers

    What is the primary advantage of using the equivalent system for preparing standard solutions in titrimetric analysis?

    <p>It allows for simpler calculations at the endpoint.</p> Signup and view all the answers

    When would the direct method for preparing standard solutions be used?

    <p>When the substance is a primary standard.</p> Signup and view all the answers

    What is the purpose of the indirect method for preparing standard solutions?

    <p>To determine the exact concentration of the solution.</p> Signup and view all the answers

    Which of the following is NOT a characteristic of empirical solutions?

    <p>They are frequently used in industrial analytical laboratories.</p> Signup and view all the answers

    What is the primary function of blood plasma?

    <p>To transport chemical substances between cells and the external environment</p> Signup and view all the answers

    Which of the following is NOT a common application of pH control mentioned in the text?

    <p>Regulating pH in beverages to enhance flavor</p> Signup and view all the answers

    For a strong acid or base, the pH can be calculated using which of the following expressions?

    <p>pH = -log[H+]</p> Signup and view all the answers

    If the concentration of a weak acid, HAc, is Ca and its dissociation constant is Ka, what is the expression for the pH?

    <p>pH = ½pCa + ½pKa</p> Signup and view all the answers

    What is the relationship between pH and pOH for aqueous solutions, according to the text?

    <p>pH + pOH = 14</p> Signup and view all the answers

    What is the expression for the pH of a strong base with concentration Cb, according to the text?

    <p>pH = 14 - pCb</p> Signup and view all the answers

    What is the relationship between the concentration of the base (Cb), the equilibrium constant of the base (Kb), and the concentration of hydroxide ions ([OH-]) in a weak base solution?

    <p>[OH-]^2 = Cb * Kb</p> Signup and view all the answers

    What is the pH of a salt solution formed from a strong acid and a strong base?

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

    What is the pH of a salt solution formed from a strong acid and a weak base?

    <p>pH = 1/2 pKw - 1/2 pKb + 1/2 pCs</p> Signup and view all the answers

    What is the purpose of buffer solutions?

    <p>To maintain a constant pH upon addition of small amounts of acid or base</p> Signup and view all the answers

    What is the mechanism that serves to maintain normal blood pH?

    <p>The brain, lungs, and kidneys function together in a complex synergy</p> Signup and view all the answers

    More Like This

    Use Quizgecko on...
    Browser
    Open
    Browser
    Browser