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Chemistry

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Solutions are made that contain 0.1 moles of each of the following compounds below in 100 g of H2O. Choose the compound whose solution will have the lowest freezing point.

NaBr
MgCl2----
KClO3
CO2
MgSO4


I know the answer is MgCl2
but I don't know how to get it. I know I have to use a periodic table but don't see the solution please explain

  • Chemistry - ,

    The secret is remembering a little emphasized point when these problems are worked. That point is---"the extent to which these thing happen depends SOLELY on the number of dissolved particles."
    So how many particles do we get when NaCl dissolves.
    NaCl ==> Na^+ + Cl^- = 2.
    MgCl2 ==> Mg^+2 + 2Cl^- = 3
    KClO3 ==> K^+ + ClO3^- = 2
    CO2 ==> doesn't dissolve to an appreciable extent and what little dissolves doesn't produce many ions so let's call this zero.
    MgSO4 ==> Mg^+2 + SO4^-2 = 2
    So which one produces the largest number of particles (all of them are the same molality). That would be MgCl2.

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