Indirect Gravimetric Determination of a Hydrated Compound in a Mixture

Indirect Gravimetric Determination of a Hydrated Compound in a Mixture

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Indirect Gravimetric Determination of a Hydrated Compound in a Mixture Ryan Kusy Mike Burke Mod- 8
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Pre-Lab Questions: 1.) 28.198 g (crucible, lid, unknown) – 26.384 g (crucible, lid) = 1.814 g (unknown sample) 28.030 g – (crucible, lid, residue) – 26.384 g (crucible, lid) = 1.646 g (residue) 1.646 / 1.814 x 100% = 90.7 % BaCl 2 in unknown sample. 2.) CaCO 3(s) CaO (g) 3 3 3 3 35 . 4 1 0 . 100 1 1 0 . 56 1 437 . 2 gCaCO molCaCO gCaCO molCaO molCaCO gCaO molCaO gCaO = × × × 4.35 g x 56 % (.56) = 2.436 g CaO in Sample 2.923 g – 2.436 g = .487 g CaCO 3 in Sample 3A. 3.520 g sample x 42.6 % CaO = 1.499 CaO 3.520 g – 1.499 g = 2.02 CaCO 3 2 2 2 3 2 3 3 3 888 . 1 0 . 44 1 1 0 . 100 1 02 . 2 gCO molCO gCO molCaCO molCO gCaCO molCaCO gCaCO = × × × 3B. 3.520 g - .888 g = 2.632 g Residue Purpose: The purpose of this laboratory is to determine the percent of BaCl 2 ● 2H 2 O in a sample of unknown composition by finding the quantity of a component in a mixture through gravimetric analysis. Reference: Bishop, Carl B., Bishop, Muriel B. and Whitten, Kenneth W. Standard and Microscale Experiments to accompany General Chemistry with Qualitative Analysis , 5 th ed.
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Florida: Saunders College Publishing, 1996. Balanced Chemical Reactions: BaCl 2 ● 2H 2 O (s) → BaCl 2 (s) + 2H 2 O (g) Hazards and Safety Issues: 1. Keep the Bunsen burner away from skin and flammable objects 2. Be careful to NOT DROP the crucible top, it will easily break. 3. After crucible is heated, allow for adequate cooling time. Place on a wire gauze because a drastic heat change will cause the crucible to shatter. Materials: Glassware Crucible and cover Hardware Crucible tongs Bunsen burner Bunsen burner stand Clay triangle Heat resistant gloves Reagents Sample of BaCl 2 ● 2H 2 O Other substance
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Procedure: Set up crucible, clay triangle, Bunsen burner, and stand
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Indirect Gravimetric Determination of a Hydrated Compound in a Mixture

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