Pure Water Graph

Colligative Properties & Osmotic Pressure

Peter Jeschofnig, Ph.D. Version 42-0149-00-01

Lab RepoRt assistant

This document is not meant to be a substitute for a formal laboratory report. The Lab Report Assistant is simply a summary of the experiment’s questions, diagrams if needed, and data tables that should be addressed in a formal lab report. The intent is to facilitate student’s writing of lab reports by providing this information in an editable file which can be sent to an instructor

obseRvations & QUestions - paRt i

A. Record your observations and your time and temperature data in tables. Use one table for the pure water and one table for the salt solution.

Data Table 1: Pure Water and Salt Solution | Seconds | Distilled H20Room temp | Distilled H20 Ice bath | SaltwaterRoom temp | Saltwater Ice bath | 0 | 25 | 19 | 24 | 12 | 30 | 24 | 13 | 23 | 8 | 60 | 23 | 11 | 22 | 5 | 90 | 22.5 | 9 | 22 | 0 | 120 | 22.5 | 8 | 22 | 1 | 150 | 22.5 | 6 | 22 | 1 | 180 | 22.5 | 5 | 22 | 1 | 210 | 22.5 | 5 | | 1 | 240 | | 5 | | 1 | 270 | | 5 | | | 300 | | 5 | | | 330 | | | | | 360 | | | | | 390 | | | | | 420 | | | | | 450 | | | | | 480 | | | | | 510 | | | | | 540 | | | | | 570 | | | | | 600 | | | | | 630 | | | | | 660 | | | | |

Make two graphs of your data. On one graph plot the data from the pure water. On the other graph plot the data from the salt solution. On both plot temperature on the y-axis and time on the x-axis.

B. Record the freezing point of the pure water and the freezing point of the salt solution.
Freezing Point of Salt Sol: 1 degrees Celcius
Freezing Point of Pure H2O: 5 degrees Celcius

C. How do these two freezing points compare?
The freezing point of salt water is lower than the freezing