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Doubt in concentration terms

  1. May 18, 2016 #1
    I want to ask that how to understand the relation of different concentration terms.
    Like the relation of Molality, Molarity & Density & related relations of concentration terms.
    So how to understand the relations easily?
     
  2. jcsd
  3. May 18, 2016 #2

    DrClaude

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    Staff: Mentor

    Maybe you can start by listing the definition of each. I think this will help you see the relations.
     
  4. May 18, 2016 #3

    James Pelezo

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    Gold Member

    Excellent question, difficult to answer ... Defining each term is definitely a place you should start, but you should also try to understand why different concentration term is used and in what context they are used. Molarity defines the distribution of solute in solvent and lends itself nicely to reactions in solution. Molarity = moles solute / Volume of solute in liters is solved for moles = Molarity x Volume of Solution used. This can be related to the balanced chemical equation to determine reaction outcomes upon mixing of solutions. Molality is a concentration term that remains constant for systems (solutions) that are going through a thermal history. Molarity is not constant with changes in temperature of a solution because volume expands or contracts as a function of temperature. Application to calculations of boiling point elevation and freezing point depression calculations are examples. Density is a general term for mass of substance (or, solution) per unit volume and is a term used to characterize pure substances or standard solutions with fixed concentration of solute compositions. There is no substitute for working as many solution phase stoichiometry problems as you can. A comprehensive understanding of the concepts is how much experience you have in working with the various systems. Good luck.
     
  5. May 18, 2016 #4

    Borek

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    Staff: Mentor

  6. May 18, 2016 #5

    James Pelezo

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    Gold Member

     
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