# Ap Bio Lab Report Osmolarity

630 Words3 Pages
I. Title-Osmolarity of Plant Cells II. Introduction- a. Background information-In this lab I conducted an experiment to determine the Osmolarity of plant cells. Osmolarity is defined as, “the number of osmoles of solute per liter of solution.” In this cause the solution was sugar water. Osmolarity involves the movement of water across a cell membrane which is osmosis, this movement of water can be hypertonic; a higher concentration of a solute inside the cell which means the cell loses mass, hypotonic; a lower solute concentration inside the cell than outside which means the cell gains mass, or isotonic; a solute concentration the same as the outside of the cell which means there is no net movement of water. In a hypertonic solution in a cell water will leave the cell in order to balance the solute concentration making the cell shrink, in a hypotonic solution however water will enter the cell to balance the concentration. In an isotonic solution water will not move since both sides are equal in concentration. b. Purpose-The purpose of this lab was to determine the osmolarity of plant cells by using potato cores as the cells and sugar as the solute. c. Hypothesis-My hypothesis was that if the amount of solute increases then the then potato core’s weight decreases. III. Materials & Procedures- In this experiment I used a stir-rod, six Erlenmeyer flasks, a ti-84c+ calculator, a bag of sugar, saran-wrap, a triple beam scale, a tare boat, a pencil, a notebook, paper towels, potatoes, potato corer, a scalpel, and tap water. The first step in the experiment was gathering the materials together, then I first weighed the tare boat which was 6.9g and then I weighed different groups of sugar, going from .2 up to 1 mole. To do this I took the molar mass of sugar, 342.30g and multiplied it by .1. Then I separately multiplied 34.23 by .2, .4, .6, .8, and 1. After