Electronegativity influencing solubility

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Erica Harris 3H
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Joined: Fri Sep 26, 2014 2:02 pm

Electronegativity influencing solubility

Postby Erica Harris 3H » Sun Nov 02, 2014 6:39 pm

How and why does electronegativity influence solubility? In questions 77 and 78, it is asked to determine which of two compounds is more soluble in water.

78. Use electronegativities to predict which of the following compounds is more soluble in water: a) LiI or MgI2; b) CaS or CaO.

K Honeychurch 1K
Posts: 27
Joined: Fri Sep 26, 2014 2:02 pm

Re: Electronegativity influencing solubility

Postby K Honeychurch 1K » Sun Nov 02, 2014 9:07 pm

The rule is "like dissolves like." So since water is a polar molecule, it dissolves polar compounds, and the more polar a compound is the more soluble it is in water. To determine which compound of the two in each part is more polar you use electronegativity. The compound with the greatest difference in electronegativity between the atoms in the compound is the most polar and therefore most soluble compound.
In part (b) Ca has a low electronegativity. Since O is more electronegative than S, CaO is more polar and therefore is more readily dissolved in water.

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