Question

which of the following best represents how an ionic compound is dissolved in water?

Explanation:

To determine how an ionic compound dissolves in water, we recall that water is a polar molecule (\(H_2O\) has a partial negative charge on \(O\) and partial positive on \(H\)). Ionic compounds consist of positive and negative ions. When dissolved, water molecules surround the ions: the negative end of \(H_2O\) (O) is attracted to positive ions, and the positive end (H) is attracted to negative ions, separating the ionic lattice. The correct diagram should show water molecules (with distinct polar regions) surrounding separated ions. Among the options, the one with water molecules (e.g., with red/white or blue/white representing \(H_2O\)) interacting with positive and negative ions (green/blue or charged symbols) by orienting their polar ends towards the opposite - charged ions is the correct representation. Assuming the last diagram (with blue oval - like ions and red/white water - like molecules) shows water molecules surrounding positive and negative ions (blue ovals with +/ - ) with \(H_2O\) (red = O, white = H) oriented correctly (O near +, H near - ), this represents the hydration of ions from the ionic compound.

Answer:

The bottom - most diagram (with blue oval - shaped ions and red/white water - like molecules surrounding them, showing polar attraction between water and ions)