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Introduce the challenge of identifying an unknown liquid. Show students the four liquids they will be working with: water, salt water, alcohol, and detergent solution. Tell students that since the liquids are different, they should look and act differently when placed on a surface like plastic, paper, or something else.
For the liquid unknown, you will take a micro bp, you will take an IR spectrum using the sandwich cell NaCl method, do solubility tests and, based upon an analysis of this information, do specific functionality tests as described in the manual. Once again, submit a preliminary analysis form.
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.
2. Simple tests you can do. OK. I've convinced you that identifying unknown chemicals is important. Let's talk about some methods of identifying unknowns. The following methods are pretty simple, and most can be done in even the crummiest chemistry lab. However, before we go too far, I want to interject a warning:
4. Final determination of the unknown liquid . Using the data collected for density, boiling point, and refractive index of the unknown liquid identify the unknown liquid. See Table 1 below. If more than one unknown or if none of the unknowns agree with your data then your measurements were not accurate enough and should be repeated. Table 1.
Identifying an Unknown Liquid. Explain that each liquid is made up of different molecules. The molecules have different characteristics, and they interact with the wax paper and construction paper in their own unique way. Grade 5 - Lesson 2.2 Identifying an Unknown Liquid 4 www.acs.orginquiryinaction American Chemical Society 21
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When finished measuring the index of refraction of your unknown liquid, wipe it off using a Kimwipe. Never wipe a dry prism surface with a dry Kimwipe. One or the other ought to be wet with a liquid. Using the data collected for density, boiling point, and refractive index of the unknown liquid identify the unknown liquid. See Table 3.1 below.
