We’re being asked to select the solvent that will most effectively dissolve NaCl. Recall that the main idea in dissolution is like dissolves like, which means compounds with the same polarity and intermolecular force can dissolve each other.
NaCl is an ionic compound, an appropriate solvent is a polar compound with a strong IMF. So for this, we need to draw the Lewis structures of the given choices and determine their polarity.
Step 1: Carbon (EN = 2.5) is less electronegative than chlorine (EN = 3) so carbon is the central atom.
Step 2: The total number of valence electrons present in CH2Cl2 is:
Group Valence Electrons
C 4A 1 × 4 e– = 4 e–
H 1A 2 × 4 e– = 2 e–
Cl 7A 2 × 7 e– = 14 e–
Total: 20 valence e–
The Lewis structure of CH2Cl2 is:
Select the solvent below that will most effectively dissolve NaCl
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