Solutions: Strength of Electrolytes

Test various concentrations of electrolytic solutions in order to determine the relationships among degree of dissociation, solute concentration, and electrolytic strength.

Lab Summary

In this exploration, students will use a conductivity sensor and voltage/current sensor to test various concentrations of electrolytic solutions in order to determine the relationships among degree of dissociation, solute concentration, and electrolytic strength.

Downloads

• Download Free Lab (PDF, 424 KB) (420 KB, .pdf)

  (student version)

Method

Use the Conductivity Sensor and the Voltage/Current Sensor to test electrolyte solutions of various concentrations and determine the relationships among degree of dissociation, solute concentration, and electrolytic strength.

Here's What You Need

U.S. Educator prices shown.

Probeware

PASPORT Conductivity Sensor (PS-2116A) - $108

Our Conductivity Sensor uses platinum for greater range and better linearity.

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PASPORT Voltage-Current Sensor (PS-2115) - $99

Voltage, current and power -- our Voltage/Current Sensor measures them all simultaneously, either on a digital display or graphed over time.

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Xplorer GLX (PS-2002) - $329

(or alternate PASPORT interface — see other options)

The world's first graphing logger for science that truly stands alone... the Xplorer GLX captures, analyzes, annotates, stores and prints data quickly and seamlessly, without being connected to a computer.

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Other Products

Small Tripod Base and Rod (SE-9451) - $23

The steel rod is 9.5 mm (3/8 in.) in diameter and 50 cm long.

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Buret Clamp (SE-9446) - $11

The V-shaped, plastic-coated jaws will gently hold a buret and lock at any angle.

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Other Materials

• Zinc wire/strip
• Copper wire
• Beaker, 150 mL
• 1.0 M hydrochloric acid, HCl
• 0.1 M hydrochloric acid, HCl
• Glacial acetic acid, CH₃CO₂H
• 0.1 M acetic acid, CH₃CO₂H
• 0.01 M calcium hydroxide, Ca(OH)₂
• 0.1 M ammonia, NH₃
• 0.1 M copper(II) sulfate, CuSO₄
• 0.1 M ammonium chloride, NH₄Cl
• Water
• Water, distilled
• Wash bottle and waste container
• Cardboard or foam board

Lab Manual

This activity is included in Explorations in Chemistry (PS-2808), complete with Teacher Information pages, student instructions and handouts, and sample data for a total of 25 probeware-based labs. For your convenience, we offer bundles which provide the probeware necessary for the activities in the manual. For more information on these resources and bundles, click here.