claim: The ovary is part of the male reproductive system.
evidence: The van ' t Hoff factor -LRB- named after J. H. van ' t Hoff -RRB- is a measure of the effect of a solute upon colligative properties such as osmotic pressure , relative lowering in vapor pressure , boiling-point elevation and freezing-point depression .. colligative properties. colligative properties. osmotic pressure. osmotic pressure. vapor pressure. vapor pressure. boiling-point elevation. boiling-point elevation. freezing-point depression. freezing-point depression. The van ' t Hoff factor is the ratio between the actual concentration of particles produced when the substance is dissolved and the concentration of a substance as calculated from its mass .. concentration. concentration. For most non-electrolytes dissolved in water , the van ' t Hoff factor is essentially 1 .. For most ionic compounds dissolved in water , the van ' t Hoff factor is equal to the number of discrete ions in a formula unit of the substance .. formula unit. formula unit. This is true for ideal solutions only , as occasionally ion pairing occurs in solution .. At a given instant a small percentage of the ions are paired and count as a single particle .. Ion pairing occurs to some extent in all electrolyte solutions .. electrolyte. electrolyte. This causes the measured van ' t Hoff factor to be less than that predicted in an ideal solution .. ideal solution. ideal solution. The deviation for the van ' t Hoff factor tends to be greatest where the ions have multiple charges .