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الموضوع: Strong Electrolytes

  1. #1
    عضو ذهبي الصورة الرمزية عزمي الزبن
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    Jul 2011
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    افتراضي Strong Electrolytes

    Strong Electrolytes

    In the case of a strong electrolyte, something else happens. We know that for a solution to conduct electricity, there must be ions in that solution. So if a material (solid, liquid, or gas) goes into solution and allows the solution to conduct electricity, then it must have been ionized or split into ions in the process. So the general format for an equation for the dissolution of a strong electrolyte is that the material, AB (solid, liquid, or gas) will change to the aqueous A+ ion, plus the aqueous B- ion.

    AB(s,l,g) A+(aq) + B-(aq)
    or
    A2B(s,l,g) 2 A+(aq) + B2-(aq)
    In other words, the material not only goes into solution and is surrounded by water molecules, it also is ionized, that is, it splits up into ions. Any time an ionic compound dissolves in water, this is the process that takes place. There are also some molecular materials that will ionize in water. The second equation is shown to make sure that you realize that sometimes an ionic compound will split into more than two ions. It might split into three or four or more.
    Hydrogen chloride is a gaseous molecular material that can be viewed as splitting up into ions when it dissolves in water. A better view is that it chemically reacts with water and we will explore that approach later in the lesson on acids and bases.

    HCl(g) H+(aq) + Cl-(aq)
    When the ionic compound sodium chloride dissolves in water, the sodium ions and chloride ions from the salt crystal separate from each other and become surrounded by water molecules.

    NaCl(s) Na+(aq) + Cl-(aq)
    In this next case, we have the compound Na2SO4 which splits into two Na+ ions for every one SO42- ion when it dissolves. You should remember that sulfate ion is a polyatomic ion and does not break up into separate sulfur and oxygen ions or atoms. If you don't remember that, you should take some time before you finish this lesson to review the names and formulas of the polyatomic ions that you learned during the previous course.

    Na2SO4(s) 2 Na+(aq) + SO42-(aq)

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  2. #2
    مراقب عام الصورة الرمزية Eiman
    تاريخ التسجيل
    Jul 2011
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    افتراضي رد: Strong Electrolytes

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  3. #3
    عضو مميز الصورة الرمزية قمر بلحاج
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    Jul 2012
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    افتراضي رد: Strong Electrolytes

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