1 / 10

Classifying mixtures

This experiment demonstrates how to classify mixtures as solutions or colloids by utilizing the Tyndall effect. Materials used include sodium hydrogen carbonate, cornstarch, distilled water, and a flashlight. First, a cornstarch paste is created, then various mixtures are prepared in jars. After turning off the lights, a flashlight is used to shine light through each jar, allowing for observation of whether light passes through—indicating a solution—or scatters—indicating a colloid. This lab emphasizes the importance of using distilled water for accurate results.

thiery
Télécharger la présentation

Classifying mixtures

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Classifying mixtures Amber Sager

  2. purpose • To classify mixtures as solutions or colloids using the Tyndall effect

  3. materials • sodium hydrogen carbonate • cornstarch • stirring rod • distilled water (or tap water) • flashlight • masking tape • 3 jars with parallel sides • teaspoon • cup

  4. procedure • In a cup, make a paste by mixing 1/2 teaspoon cornstarch with 4 teaspoons water.

  5. Procedure • Fill one jar with water. Add one half teaspoon sodium hydrogen carbonate to a second jar and fill with water. Stir to mix. Add the cornstarch paste to the third jar and fill with water. Stir to mix.

  6. procedure • Turn out the lights in the room. Shine the beam of light from the flashlight at each of the jars and record your observations Water Baking Soda Corn Starch

  7. Conclusion • Some of the sources of error for this lab would be that I forgot to use the distilled water so I ended up using that tap water. That might have effected my results because tap water has certain minerals that distilled water doesn’t have. I can improve next time by following the directions completely.

  8. conclusion • The jars that I could see the light through were the water and water mixed with baking soda. I believe what made the light visible was that the mixtures had particles that were too tiny. If it was filtered I don’t think you would be able to see through it because the water is what makes it able to see through. If you were to replace the baking soda with sugar or salt I think it would be the same result because your salt and sugar are small.

  9. Conclusion • If you were to replace the corn starch with flour or diluted milk it would again cause the same thing because of the consistency of the three items. You can distinguish a colloid from a suspension because you can’t see through a colloid but you can see through a suspension.

  10. CA state standard

More Related