Concentrate!

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In this investigation of reaction kinetics, learners alter the amount of iodate solution mixed with the same amount of starch solution. Visitors observe the solutions to see which concentration of iodate reacts the most quickly. Learners come to understand that the speed of a chemical reaction is dependent on the concentration of the chemicals involved. This activity is currently used in the Chemical Reactions Unit in OMSI's Chemistry Lab. Cost estimates are per 100 learners. For safety reasons, this activity is best conducted as a demonstration for younger audiences.

Quick Guide

Preparation Time:
30 to 45 minutes
Learning Time:
5 to 10 minutes
Estimated Materials Cost:
$1 - $5 per group of students
Age Range:
Ages 14 - adult
Resource Types:
Activity, Demonstration, Experiment/Lab Activity
Language:
English

Materials List (per group of students)

  • (3) 10-mL test tubes
  • test tube rack
  • (3) 50-mL beakers
  • 10-mL graduated cylinder
  • 30-mL dropper bottle
  • 250-mL squeeze bottle
  • 100g potato starch
  • 100-mL 1M sulfuric acid (H2SO4)
  • 25g sodium metabisulfite (Na2S2O5)
  • 100g potassium iodate (KIO3)

Keywords

Subjects

  • Physical Sciences
    • Chemistry
      • Chemical Reactions
      • Solutions

Audience

To use this activity, learners need to:

  • see
  • see color
  • read
  • touch

Learning styles supported:

  • Involves hands-on or lab activities

Other

This resource is part of:

Access Rights:

  • Free access

By:

Rights:

Funding Source:

  • National Science Foundation, 9355628