Mixtures and Solutions

We kicked off our unit on mixtures and solutions Monday. Students combined diatomaceous earth and water, NaCl and water, and gravel and water. After making mixtures, they attempted to get me all the ingredients back. A screen was used to get the gravel back, but was too big for the diatomaceous earth. So, someone suggested a paper filter. This was successful, but didn't get back the NaCl, as it was a special mixture called a solution. Wednesday we will investigate how to get back the NaCl.