Cleaning coins

Lesson: Science

Class: Mary - Year 3/4 Year: 2024 - 2025

The children in Mary class have been making enquries into which substance would be the most effective at cleaning a dirty coin. They made sure to carry out a fair test by keeping the amount of solution the same and testing for the same amount of time. They even tested each solution againt the pH scale to see the acidity of each substance. After their experiment they did an extra test, adding some bicarbonate of soda to each solution to see if that cleaned the coins any better. They liked when the soda reacted with some of the solutions and began to bubble and foam.