2D.7

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Annie Ye
Posts: 106
Joined: Wed Sep 18, 2019 12:22 am

2D.7

Postby Annie Ye » Mon Dec 02, 2019 3:42 pm

Compounds having bonds with a high covalent character tend to be less soluble in water than similar compounds that have low covalent character. Use electronegativities to predict which of the following compounds is the more soluble in water: (a) AlCl3 or KCl; (b) MgO or BaO.

Vanessa Chuang 4F
Posts: 51
Joined: Sat Aug 24, 2019 12:18 am

Re: 2D.7

Postby Vanessa Chuang 4F » Mon Dec 02, 2019 6:07 pm

The more ionic character something has, the more soluble it is.
In order to determine the molecule with the greatest ionic character, you look for the molecule that has the greatest electronegativity difference between its cation and anion.
For a, KCl has a greater difference; therefore, it is more soluble than AlCl3
For b, between MgO and BaO, Ba has a bigger radius than Mg, making the electronegativity difference between Ba and O greater than that of Mg and O.
Therefore, BaO is more soluble


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