Two solutions that have the same osmotic pressure at a given temperature are described as:

1. Osmotic pressure is a colligative property depending on solute particle count. 2. Solutions with equal osmotic pressure are called isotonic; no osmosis occurs between them across a membrane. 3. Hypertonic and hypotonic refer to higher and lower concentrations relative to a cell, not equality. _Source: syllabus Chemistry Ch 1 "Solutions", p.21_