Vernier Software and Technology
Vernier Software & Technology

Conductivity of Solutions: The Effect of Concentration

Figure from experiment 14 from Chemistry with Vernier

Introduction

If an ionic compound is dissolved in water, it dissociates into ions and the resulting solution will conduct electricity. Dissolving solid sodium chloride in water releases ions according to the equation:

{\text{NaCl(s)}} \to {\text{N}}{{\text{a}}^{\text{+ }}}{\text{(aq)  +  C}}{{\text{l}}^{\text{- }}}{\text{(aq)}}

In this experiment, you will study the effect of increasing the concentration of an ionic compound on conductivity. Conductivity will be measured as concentration of the solution is gradually increased by the addition of concentrated NaCl drops. The same procedure will be used to investigate the effect of adding solutions with the same concentration (1.0 M), but different numbers of ions in their formulas: aluminum chloride, AlCl3, and calcium chloride, CaCl2. A Conductivity Probe will be used to measure conductivity of the solution. Conductivity is measured in microsiemens per centimeter (μS/cm).

Objectives

In this experiment, you will

  • Use a Conductivity Probe to measure the conductivity of solutions.
  • Investigate the relationship between the conductivity and concentration of a solution.
  • Investigate the conductivity of solutions resulting from compounds that dissociate to produce different number of ions.

Sensors and Equipment

This experiment features the following Vernier sensors and equipment.

Option 1

Option 2

Additional Requirements

You may also need an interface and software for data collection. What do I need for data collection?

Standards Correlations

See all standards correlations for Chemistry with Vernier »

Experiment 14 from Chemistry with Vernier Lab Book

<em>Chemistry with Vernier</em> book cover

Included in the Lab Book

Vernier lab books include word-processing files of the student instructions, essential teacher information, suggested answers, sample data and graphs, and more.

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