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Acid Strengths

Figure from experiment 18 from Physical Science with Vernier

Introduction

Acids react with metals. For example, hydrochloric acid reacts with zinc metal according to the equation

{\text{Zn(s)  +  2 HCl(aq)}} \to {{\text{H}}_{\text{2}}}{\text{(g)  +  ZnC}}{{\text{l}}_{\text{2}}}{\text{(aq)}}

Strong acids react faster and more vigorously with metals than do weak acids. Because water solutions of acids contain ions, these solutions conduct electricity. The measure of electrical conductivity is related to the number of ions in solution. Conductivity units are microsiemens per centimeter (μS/cm).

Objectives

In this experiment, you will

  • React zinc metal with various acids.
  • Measure electrical conductivity.
  • Investigate the relationships among acid strength, electrical conductivity, degree of ionization, and chemical activity.

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 Physical Science with Vernier »

Experiment 18 from Physical Science with Vernier Lab Book

<em>Physical Science 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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