CHEM 2112- fall 2016 Chta Quantitative Analysis Experiment 5 Gravimetric Analysi

Question

CHEM 2112- fall 2016 Chta Quantitative Analysis Experiment 5 Gravimetric Analysis (Analytical The Percent of Water in Barium Chloride Chemistry for Technician, Third Ed. John Kenkel, Lewis Publishers) Modified by H. McWhinney Student Name Mass of Mass of Mass of water in Hydrated Dehydrated Water Barium Chloride Julisa R. Allen 700 up 15.2 Auchet R. Anderson rpo Tasneem A Bhinderwala Marshall D. Joseph Kira C. Kirkham Colby J. Malveaux 1026/ Sanjuana F. Perez Kentrell Smith. Megan A. Stennis Jasmine V. Winston

Explanation / Answer

     

You first need the chemical formula for barium chloride which is BaCl2. The BaCl2 is dihydrate so each molecule of BaCl2 is attached to two water molecules.

BaCl2 2H2O

Calculate the molecular weight of BaCl2 2H2O. Assume you have 1 mole, calculate how many grams you have. In one mole BaCl2 2 H2O you also have 2 moles of water. Calculate the mass of 2 moles of water. Divide the mass of water by the mass of BaCl2 2H2O and convert to a percentage.

Total mass of BaCl2.2H2O = 137 + (35.5*2) + (2*18) = 244 g/mol

mass of water in molecule of BaCl2.2H2O = 18 g * 2 = 36 g

therefore: (36 g/244g) * 100 = 14.8%

Hence we can calculate the mass of water in BaCl2 by dividing the mass of water by mass of hydrated BaCl2 multiplied by 100 & the answers obtained in table conform to this.

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