At this point, the student was called to the Guidance Office. When she returned to the lab at lunch, she reheated the test tube and light colored product. After reheating and cooling, the product was still light colored and had a mass of 19.13 g. Explain your reasoning using only information from the student's data. See earlier diagrams 2.
Water droplets gather at the neck of the test tube as the reaction progresses.
The escaping water vapor turns blue-green when the flame touches it. When water is added to the cool, powdery anhydride, so much heat is released that the water fizzes audibly. In addition, the test tube becomes hot to touch, and the powder turns bright blue again as the hydrate reforms. She was wise to return, since all the water had not been vaporized earlier from the hydrate. Go to Top Go to Teachers Index Check List List the following techniques on the chalkboard.