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الموضوع: Solubility Rules

  1. #1
    عضو ذهبي الصورة الرمزية عزمي الزبن
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    Jul 2011
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    افتراضي Solubility Rules

    Solubility Rules

    Solubility Rules for Ionic Compounds

    You will be responsible for being able to use the solubility rules, but you will not be responsible for memorizing the solubility rules. A table of solubility rules is in your workbook as example 7. If you would like a brief explanation of what is contained in the table, read on. If the table is self-explanatory to you try your hand at exercise 8 in your workbook (also shown below) and then check your answers at the bottom of this page.
    Explanation of the Solubility Rules Table

    The first column lists the "type of compound" and the next two columns list which of those substances are soluble and which are insoluble or slightly soluble.


    N
    itrates (i.e. ionic compounds containing nitrate ions), it says, are all soluble.
    Chlorides, it says, are all soluble except for some that are listed as copper(I), lead(II), mercury(I) and silver.

    All sulfates are soluble except those listed under the insoluble category.

    With hydroxides the pattern turns around. The previous pattern was that most
    compounds were soluble with some exceptions. With hydroxides it is the other way around. There is a short list of those that are soluble: NaOH, KOH, NH4OH, Ca(OH)2, Sr(OH)2, Ba(OH)2. The rest of them are insoluble.
    For sulfides, again there is a short list of soluble ones
    while the rest are insoluble.
    Again with carbonates and phosphates we have a short list of soluble
    ions with these polyatomic ions and all the rest are insoluble.
    Perhaps you noticed that the group 1-A metals (Na+ and K+) and ammonium ion were always listed as being soluble. So that can be another rule, and it is shown on the next line.

    Solubility Rules for Ionic Compounds:
    (Also shown in example 7 in your workbook.)

    Type of compound Soluble
    Insoluble or
    Slightly Soluble {ss}

    Nitrates All ---
    Chlorides All except those listed as insoluble Copper(I)
    Lead(II) {ss}
    Mercury(I)
    Silver
    Sulfates All except those listed as insoluble Strontium
    Barium
    Calcium {ss}
    Silver {ss}
    Lead(II)
    Hydroxides Sodium
    Potassium
    Ammonium

    All except those listed as soluble,
    Calcium {ss}
    Strontium {ss}
    Barium {ss}
    Sulfides Ammonium
    Group IA metals
    Group IIA metals
    All except those listed as soluble
    Carbonates & Phosphates Ammonium
    Group IA metals
    All except those listed as soluble
    Ammonium & Group IA metals All ---


    Practice Using the Solubility Rules

    Now you should use these solubility rules to decide whether or not some compounds are soluble. So take some time now to determine whether the following compounds are soluble or insoluble. (These are also listed in exercise 8 in your workbook.) After you have done that, check your answers below.
    NaOH Fe2S3 MgSO4 PbCl2 Ba(NO3)2 MgCO3

    Answers

    NaOH Fe2S3 MgSO4 PbCl2 Ba(NO3)2 MgCO3
    soluble insoluble soluble insoluble soluble insoluble
    Note that Fe2S3 is a sulfide rather than a sulfate.

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  2. #2
    مراقب عام الصورة الرمزية Eiman
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    افتراضي رد: Solubility Rules

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  3. #3
    عضو مميز الصورة الرمزية قمر بلحاج
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    افتراضي رد: Solubility Rules

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