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Solution: Which of the schematic drawings best describes a solution of Li2SO4 in water (water molecules not shown for simplicity)?

Problem

Which of the schematic drawings best describes a solution of Li2SO4 in water (water molecules not shown for simplicity)? Diagrams show (a) a negative two atom bonded to two positive one atoms; (b) five negative two and three positive one ions in solution; or (c) three negative two and five positive one ions.

Solution

We’re being asked to determine the right representation of Li2SO4 in water.


The choices are:


Recall that according to the solubility rules: Group 1A ions (Li+, Na+, K+, etc.). 

  • The ionic compound given contains a Group 1A metal, lithium. Therefore, automatically, the compound is soluble.
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