Curious Maria

what is the advantage of carrying out distillation processes under reduced pressures??

And ALSO
can someone tell me the criteria used in selecting primary standards? i.e. NaHCO3, Na2CO3, KIO3, (COOH)2 and its salt as primary standard

  1. 👍 0
  2. 👎 0
  3. 👁 316
  1. yeh it is (provided that ur not being sarcastic here)

    i'm wondering if by at reduced pressure, it would be somewhat easier to collect the distillates because the temp. is also reduced thus it would be easier to ascertain them as the temp aren't changing too rapidly...

    1. 👍 0
    2. 👎 0
  2. The whole idea behind distillation at reduced pressure is that the boiling point is lowered, usually significantly. Therefore, something that boils at 250 C at 1 atmosphere (and is an organic material) PROBABLY will decompose (and there goes that compound it took you 2 weeks to prepare), BUT if the pressure is reduced it may boil at say 75 degrees C and it doesn't break apart at the lower temperature.
    The second question, regarding primary standards:
    For a primary standard, we want something that is relatively inexpensive, stable, has a known composition, reacts stoichiometrically with whatever we are trying to standardize, as well as reacting within a certain pH range (if acid/base) or redox potential (if a redox titration). I hope I have interpreted your question correctly.

    1. 👍 0
    2. 👎 0

Respond to this Question

First Name

Your Response

Similar Questions

  1. Chemistry

    Which of the following statements is true? All spontaneous processes are exothermic All non-spontaneous processes are exothermic All spontaneous processes release free energy*** Entropy always increases in a spontaneous process

  2. Entrepreneurship

    What Is Competive Advantage?? Competitive advantage is the advantage which helps a firm to compete with other i.e the the relative advantage of a firm in field of competion compared to the other firm What is monopoly?

  3. chemistry

    PCL5(g) -> PCl3(g) + Cl2 (g) Kp= 23.6 at 500K Calculate the equlibrium partial pressures of the reactants and products if the initial pressures are Ppcl5 = 0.560atm and Ppcl3 = 0.500atm.

  4. Physics

    Suppose you measure a standing person's blood pressure by placing the cuff on his leg 0.470 m below the heart. Calculate the pressures you would observe if the pressures at the heart are 119 over 80 mm Hg. Assume there is no loss

  1. chem

    if a fractional distillation failed to separate two components efficiently, what alternatives would one consider to effect clean separation by distillation?

  2. Math 156

    The systolic blood pressures of the patients at a hospital are normally distributed with a mean of 136 mm Hg and a standard deviation of 13.4 mm Hg. Find the two blood pressures having these properties: the mean is midway between

  3. Organic Chemistry

    Assume that a round bottom flask holds 100 mL and the distilling head has an internal volume of 12 mL in the vertical section. At the end of a distillation, vapor would fill this volume, but it could not be forced through the

  4. Finance

    Risk exposure due to heavy short-term borrowing can be compensated for by: A. carrying more receivables to increase cash flow. B. carrying highly liquid assets. C. carrying illiquid assets. D. carrying longer term, more profitable

  1. Science(need help)

    1) What evidence is there that the human species has been successful so far? Explain. 2) What environmental pressures in the past do you think were most important in shaping the human species as it exists today? 3) What

  2. physics

    Objects deep beneath the surface of the ocean are subjected to extremely high pressures. Some bacteria in these environments have adapted to pressures as much as a thousand times atmospheric pressure. How might such bacteria be

  3. Chemistry

    Nitrogen monoxide reacts with chlorine gas according to the reaction: 2NO (g) + Cl2 (g) ⇔ 2NOCl (g) Kp = 0.27 at 700 K A reaction mixture initially contains equal partial pressures of NO and Cl2 . At equilibrium, the

  4. science help pls pls

    Which of these statements best explains why scientists use models? to allow other scientists evaluate their data to speed up or slow down natural processes to describe and explain non-observable objects and processes to predict

You can view more similar questions or ask a new question.