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4. A student was asked to determine the percentage of the components of a binary mixture of KBr, potassium bromide, and Mg (OH),, magnesium hydroxide. The mass of the mixture used was 6.321 grams. The student extracted the KBr with water since KBr is soluble in water and Mg(OH), is not. The magnesium hydroxide remained in the container after the KBr was extracted with water. After evaporation of the filtrate, the KBr residue was dried and weighed. Its dry mass was found to be 2.864g. The insoluble Mg(OH), was also dried and had a mass of 3.204 grams. a. Calculate the percent of KBr in the mixture. b. Calculate the percent of Mg(OH), in the mixture. c. Calculate the percent of recovery using the total mass of substances recovered. d. Calculate the percent error of this total recovery.

4. A student was asked to determine the percentage of the components of a binary mixture of KBr, potassium bromide, and Mg (OH),, magnesium hydroxide. The mass of the mixture used was 6.321 grams. The student extracted the KBr with water since KBr is soluble in water and Mg(OH), is not. The magnesium hydroxide remained in the container after the KBr was extracted with water. After evaporation of the filtrate, the KBr residue was dried and weighed. Its dry mass was found to be 2.864g. The insoluble Mg(OH), was also dried and had a mass of 3.204 grams. a. Calculate the percent of KBr in the mixture. b. Calculate the percent of Mg(OH), in the mixture. c. Calculate the percent of recovery using the total mass of substances recovered. d. Calculate the percent error of this total recovery.

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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4. A student was asked to determine the percentage of the components of a binary mixture of KBr, potassium bromide, and Mg (OH),, magnesium hydroxide. The mass of the mixture used was 6.321 grams. The student extracted the KBr with water since KBr is soluble in water and Mg(OH), is not. The magnesium hydroxide remained in the container after the KBr was extracted with water. After evaporation of the filtrate, the KBr residue was dried and weighed. Its dry mass was found to be 2.864g. The insoluble Mg(OH), was also dried and had a mass of 3.204 grams. a. Calculate the percent of KBr in the mixture. b. Calculate the percent of Mg(OH), in the mixture. c. Calculate the percent of recovery using the total mass of substances recovered. d. Calculate the percent error of this total recovery.
Transcribed Image Text:4. A student was asked to determine the percentage of the components of a binary mixture of KBr, potassium bromide, and Mg (OH),, magnesium hydroxide. The mass of the mixture used was 6.321 grams. The student extracted the KBr with water since KBr is soluble in water and Mg(OH), is not. The magnesium hydroxide remained in the container after the KBr was extracted with water. After evaporation of the filtrate, the KBr residue was dried and weighed. Its dry mass was found to be 2.864g. The insoluble Mg(OH), was also dried and had a mass of 3.204 grams. a. Calculate the percent of KBr in the mixture. b. Calculate the percent of Mg(OH), in the mixture. c. Calculate the percent of recovery using the total mass of substances recovered. d. Calculate the percent error of this total recovery.
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Step 1

mass percentage is the amount of one component present in 100 gm of mixture

Here we are given mixture of KBr and magnesium hydroxide and we are required to percent of each component present in the mixture

 

 

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