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    EDTA chelates with Ni2+ (aq).

    Question
    HLPaper 3

    EDTA chelates with Ni2+ (aq).

    Ni(H2O)6Ni(H2O)6Ni(H2O)62+ (aq) + EDTA4− (aq) ⇌ Ni(EDTA)Ni(EDTA)Ni(EDTA)2− (aq) + 6H2O (l)

    1.

    Explain how entropy affects this equilibrium.

    [2]
    Verified
    Solution

    entropy increases «and the reaction proceeds to the right» ✔✔✔

    more species / free molecules are formed
    OR
    more ways of distributing energy ✔✔✔

    2.

    State the number of coordinate covalent bonds EDTA forms with Ni2+.

    [1]
    Verified
    Solution

    six ✔✔✔

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