CLAW At-Home Experiment: Volumetric Analysis of Household Acid with Cabbage Juice
At a Glance
Discipline
- STEM
- Chemistry
Instructional Level
- College & CEGEP
- University
Course
- Secondary V Chemistry
- General Chemistry
- Chemistry of Solutions
Tasks in Workflow
Social Plane(s)
- Individual
Type of Tasks
- Analyzing
- Writing
- Experimenting & conducting inquiry
Technical Details
Useful Technologies
- Equipment (e.g., containers and measuring tools)
Class size
- Medium (50-99)
Time
- Single class period (< 90 mins)
Instructional Purpose
- Exploration & inquiry
Overview
In this CLAW (Chemistry Laboratory Alternative Work) At-Home experiment, students will perform an experiment using household chemicals and materials. It was designed as a substitute for in-person laboratories, usually performed at the college level, during the COVID-19 pandemic. However, it may also be used as an experiment that students can carry out in the lab or for student projects.
Instructional Objectives
Experimental Objective: Students will conduct an experiment in which the concentration of an acid found in a household product will be determined by titration using cabbage juice as the acid-base indicator.
Learning Objectives:
- Students will prepare an acid-base indicator and evaluate its colour based on pH.
- Students will prepare a titrating solution and calculate its concentration.
- Students will perform a titration and calculate the acid concentration based on the observed endpoint.
Workflow & Materials
Activity Workflow
Contributor's Notes
- This hands-on home experiment is an engaging way to manipulate and measure chemical compounds outside an official laboratory set-up;
- Experimental data recorded by the students can be analyzed to perform calculations and write a complete lab report.
- It may be difficult to estimate the time needed for students to complete this activity at home.
- Gathering of chemicals and material usually carried out by a technician must be done by each student;
- The endpoint is difficult to determine, however, the experiment provides great hands-on experience and an opportunity for students to carry out many calculations relevant to first year level courses.
- The list of chemicals and material necessary for the experiment should be given to students as soon as possible to make sure they have the time to purchase and gather the needed items;
- Equipment could be loaned out to the students from the college;
- Volume measurements can be done with measuring spoons/cups, although they may be less accurate than syringes.
Additional Contributors
- Carmen Leung, Dawson College
- Nadia Schoonhoven, Dawson College
Applied Strategies
Published: 16/07/2020
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