the crucible to red heat before adding any solid hydrate? 2. During the heating of the metal hydrate salt, you accidentally heated the crucible too rapidly to an extreme temperature. This caused the salt to decompose and release oxygen gas (O2) along with the water from the salt. Would this give a higher, lower or the same calculated mass % of water in the metal hydrate salt? 3. A student was given an unknown metal hydrate salt and asked to determine the mass percent of water in the hydrate. The student collected the following data. Trial 1 Mass of empty crucible and lid 136.269 g Mass of crucible, lid and salt before heating 141.304 g Mass of crucible, lid and salt after 1st heating Mass of crucible, lid and salt after 2nd heating Mass of crucible, lid and salt after 3rd heating 139.837 g 139.615 g 139.613 g a. Why did this experiment require a 3rd heating of the metal hydrate salt? Experimentally, why would it not make sense to stop and determine the mass % of water after the 2nd heating of the hydrate salt? Be detailed in your reasoning. b. Calculate the mass percent of water in the original metal hydrate salt. (Pay attention to significant figures through your calculations) 6

the crucible to red heat before adding any solid hydrate? 2. During the heating of the metal hydrate salt, you accidentally heated the crucible too rapidly to an extreme temperature. This caused the salt to decompose and release oxygen gas (O2) along with the water from the salt. Would this give a higher, lower or the same calculated mass % of water in the metal hydrate salt? 3. A student was given an unknown metal hydrate salt and asked to determine the mass percent of water in the hydrate. The student collected the following data. Trial 1 Mass of empty crucible and lid 136.269 g Mass of crucible, lid and salt before heating 141.304 g Mass of crucible, lid and salt after 1st heating Mass of crucible, lid and salt after 2nd heating Mass of crucible, lid and salt after 3rd heating 139.837 g 139.615 g 139.613 g a. Why did this experiment require a 3rd heating of the metal hydrate salt? Experimentally, why would it not make sense to stop and determine the mass % of water after the 2nd heating of the hydrate salt? Be detailed in your reasoning. b. Calculate the mass percent of water in the original metal hydrate salt. (Pay attention to significant figures through your calculations) 6

Introductory Chemistry: A Foundation

9th Edition

ISBN:9781337399425

Author:Steven S. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Donald J. DeCoste

Chapter9: Chemical Quantities

Section: Chapter Questions

Problem 36QAP

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