please answer 1 and 2. thanks.

Experiment 25-Colligative Properties 02: Osmosis and Dialysis Pre-laboratory Questions: \#01 \& \#04: 1. What is meant by a semi-permeable membrane? 2. Ionic solutes produce more particles when dissolved in water than is indicated by their formal concentration. For example, when one mole of NaCl is dissolved in a large amount of water, effectively two moles of solute particles are introduced into the solvent. Saline solution for injection into the human body is approximately 0.9%NaCl, whereas the dextrose (glucoses) solution used for intravenous feeding are approximately 5% dextrose. Are these two solutions isotonic when each other