Is it possible to have Volume(solution) < Volume(solvent before adding solute)? I understand the answer to the question "Is it possible to have Volume(solution) &lt; Volume(solvent) + Volume(solute)?" is "yes" -- but it is possible that adding a solute causes the solvent to contract so much that the volume of the solution is less than the initial volume of the solvent?

An ideal answer would include either a specific example of such a case, or an explanation of why it is impossible.

If the above is not possible, is it possible for the volume of the solution to equal the initial volume of the solvent?
Gosh, sure. According to various on-line info (of unknown quality) a 2% by wt. solution of NaOH in water has a density of 1.0207 at 20°C. This means 100 g of it has a volume of 97.97 ml. At 20°C water has a density of 0.9982 meaning that 98 grams of water has a volume of 98.18 ml.