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Dissolve 10 mg of a solid (or 1 drop of a liquid) unknown in the minimum amount of bis (2-ethoxyethyl)ether required to give a clear solution (less than 1 mL). Add the unknown solution dropwise, with agitation, to the first test tube. Mix vigorously and allow the solution to stand. Do the same for the known compound.
- Multistep Synthesis
You will have an opportunity to do a multistep synthesis...
- Distillation of a Mixture
To maximize the efficiency of the fractional distilling...
- Multistep Synthesis
- Objective
- Key Concepts
- NGSS Alignment
- Summary
- Evaluation
- Safety
- Clean-Up and Disposal
- Materials For Each Group
- Teacher Preparation
Students will be able to plan and carry out an investigation to identify a liquid based on how it interacts on different paper surfaces. Students will also be able to explain that since different liquids are made of different atoms and molecules, they act in their own characteristic way.
When observing different liquids, the way a liquid acts on paper is a characteristic property of the liquid and can be used to identify it.For the test to be fair, the same amount of each liquid should be placed on the paper in the same way.The different atoms and molecules in a liquid interact with the paper in a characteristic way.NGSS 5-PS1-1: Develop a model to describe that matter is made of particles too small to be seen.NGSS 5-PS1-3: Make observations and measurements to identify materials based on their properties.Students will test four known liquids and an unknown liquid on two different paper surfaces. They will use their observations to identify an unknown liquid.Students will realize that by using a combination of results from two tests, they can successfully identify an unknown liquid.Students will also add water and salt water to green food coloring on a coffee filter. They see a distinct difference in the way each liquid makes the colors in green food coloring separate.Download the student activity sheet and distribute one per student when specified in the activity. The activity sheet will serve as the Evaluate component of the 5-E lesson plan.
Make sure you and your students wear properly fitting safety goggles. Isopropyl alcohol is flammable. Keep it away from flames or spark sources. Read and follow all warnings on the label.
Remind students to wash their hands after completing the activity. Alcohol should be disposed of according to local regulations. All other common household or classroom materials can be saved or disposed of in the usual manner.
Water in cupIsopropyl alcohol (70%) in cupDetergent solution in cupSalt water in cupUse a permanent marker to label 5 small cups Water, Salt water,Alcohol, Detergent, andUnknownfor each group. The unknown is water. Make solutions for the class according to the following procedure. These recipes make 1/4 cup of each solution, which is enough for 8 groups to conduct the activity. 1. Water—Use 1/4 cup regular tap water. 2. Isopropyl ...
Put the two racks of test tubes together so that the solutions are in order 1 to 13. The test tubes now have solutions in them with pH 1 (test tube 1) to pH 13 (test tube 13). Add a drop of universal indicator to each test tube. Rock each test tube from side to side to mix the contents.
What to Do. Set up a test area with the cups and spoons in an area where spills are not an issue, such as the kitchen table. Bring your test liquids to the test area. Pour a small amount of two different liquids together into one cup and mix them together with a clean spoon. What happens to the liquids?
Identifying the unknown liquid 4. Have groups test and identify the unknown liquid. Procedure. To figure out the identity of the unknown, combine it with blue water the same way you combined the other liquids with water. Use your drawings and written observations if you need to. What do you think is the identity of the unknown? 5.
Jul 7, 2023 · 6. Match the color of the reaction to the color code on the box. When the test strip reacts with the liquid, the new color pattern indicates the pH of the liquid. The color pattern will correspond with one of the color patterns on the box. Each pH level from 0 to 14 has a unique pattern.
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Apr 26, 2018 · One interesting method of testing the pH of a liquid uses red cabbage juice as a pH indicator. When the cabbage juice is mixed with different liquids, the solution changes color thanks to a pigment in red cabbage called flavin – an anthocyanin. If the color changes to pink, the pH is 1 to 2. If the color becomes dark red, the pH is 3 to 4.
