Exp#2ColligativeProp

Exp#2ColligativeProp - Chem 12 Pre-laboratory Assignment...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Chem 12 Exp.# 2 Colligative Properties Laboratory Pre-laboratory Assignment 1. Review in Zumdahl, Section 17.5 Boiling-Point Elevation and Freezing-Point Depression , pages 844-848. 2. Typically when plotting data as a graph, the independent variable is plotted on the x-axis and the dependent variable is plotted on the y-axis. For this laboratory, a Cooling Curve (temperature vs. time) will be prepared. For the two variables, temperature and time, which is the independent variable and which is the dependent variable? 3. Explain how to calculate the molar mass of the solute from the data obtained in the Freezing-point Depression laboratory experiment. Show equations, units, etc. Introduction In this laboratory experiment, the molecular mass of an 'unknown' sample will be determined. The molecular mass of the unknown will be determined by studying the freezing-point depression of a lauric acid solution (the solvent) with a known concentration of the unknown sample (the solute). The following equation will be used in calculating the molecular mass of the unknown: D T = K fp m K fp freezing-point constant of the solvent m molality, moles of solute (mol) / mass of solvent (kg) The data for the temperature-time graphs (Cooling Curves) for both the pure sample of lauric acid and the solution of lauric acid with the unknown will be obtained in the laboratory.
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 3

Exp#2ColligativeProp - Chem 12 Pre-laboratory Assignment...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online