Law of Conservation of Mass

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In this chemistry activity, learners explore whether matter is created or destroyed during a chemical reaction. They will compare the weight of various solutions before and after they are mixed. Learners will also write balanced equations for the reactions in the experiment and use a solubility chart to predict the identity of the insoluble product. [Activity is publicly available through a web crawler capture on]

Quick Guide

Preparation Time:
30 to 45 minutes

Learning Time:
30 to 45 minutes

Estimated Materials Cost:
$5 - $10 per group of students

Age Range:
Ages 11 - 18

Resource Types:
Activity, Experiment/Lab Activity


Materials List (per group of students)

  • solutions of NaOH, CuSO4, NH4OH, and Na2CO3 (or solutions made with Drano, Bluestone algaecide, ammonia, and washing soda)
  • 4 graduated cylinders or 4-2 oz plastic cups
  • 3 150-mL beakers or 3-5 oz plastic cups
  • balance


  • Mathematics
    • Data Analysis and Probability
      • Data Analysis
      • Data Collection
  • Physical Sciences
    • Chemistry
      • Chemical Reactions
      • Solutions
    • Structure and Properties of Matter
      • Mass and Weight
  • The Nature of Science
    • The Scientific Process
      • Conducting Investigations
      • Gathering Data
      • Formulating Explanations
      • Communicating Results


To use this activity, learners need to:

  • see
  • read
  • touch

Learning styles supported:

  • Involves hands-on or lab activities


This resource is part of:

Access Rights:

  • Free access with registration