Controlling Particle Size in Crystalline Precipitates
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Questions and Answers

What technique can be used to obtain larger particles of a precipitate by controlling the pH?

  • Occlusion
  • Mixed-Crystal Formation (correct)
  • Peptization
  • Surface Adsorption

    • Which method is effective in coagulating a colloidal suspension by increasing electrolyte concentration?

  • Occlusion (correct)
  • Peptization
  • Mixed-Crystal Formation
  • Surface Adsorption

    • What process involves a short period of heating and stirring to coagulate a colloidal suspension?

  • Mixed-Crystal Formation
  • Occlusion
  • Surface Adsorption (correct)
  • Peptization

    • Which technique involves carrying normally soluble compounds out of a solution with a precipitate?

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

    How can the particle size of crystalline solids be significantly improved?

    <p>By minimizing Q, maximizing S, or both</p> Signup and view all the answers

    What is the benefit of having precipitates made up of large particles in gravimetric work?

    <p>Large particles are easily filtered and washed free of impurities</p> Signup and view all the answers

    What is a characteristic of colloidal particles?

    <p>They show no tendency to settle from solution</p> Signup and view all the answers

    What is the size range of particles that make up a colloid?

    <p>Less than 10^-4 cm</p> Signup and view all the answers

    What does a small (Q - S)/S value indicate about a precipitate?

    <p>It tends to be colloidal</p> Signup and view all the answers

    What is nucleation in the context of precipitate formation?

    <p>A process where stable solid forms from atoms, ions, or molecules joining together</p> Signup and view all the answers

    What influences the rate of nucleation during precipitate formation?

    <p>Relative supersaturation</p> Signup and view all the answers

    What is the purpose of digestion in reducing coprecipitation?

    <p>To help reduce occlusion and mechanical entrapment</p> Signup and view all the answers

    What is homogenous precipitation?

    <p>Formation of a precipitate by slow generation of a reagent throughout a solution</p> Signup and view all the answers

    What happens after filtration of a gravimetric precipitate?

    <p>The precipitate is washed and then ignited</p> Signup and view all the answers

    Why are homogeneously formed precipitates better suited for analysis?

    <p>Because they are easier to weigh accurately</p> Signup and view all the answers

    What occurs during the ignition step of precipitates?

    <p>The precipitate is heated to decompose the solid and form a compound of known composition</p> Signup and view all the answers

    How are results of a gravimetric analysis computed?

    <p>From the mass of sample and the mass of a product with known composition</p> Signup and view all the answers

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